diff --git a/lcl/interfaces/cocoa/cocoaint.pas b/lcl/interfaces/cocoa/cocoaint.pas
index 2d82233769..c96ef4abdb 100644
--- a/lcl/interfaces/cocoa/cocoaint.pas
+++ b/lcl/interfaces/cocoa/cocoaint.pas
@@ -48,8 +48,8 @@ type
 
   { TCocoaTimerObject }
 
-  TCocoaTimerObject=objcclass(NSObject)
-    func : TWSTimerProc;
+  TCocoaTimerObject = objcclass(NSObject)
+    func: TWSTimerProc;
     procedure timerEvent; message 'timerEvent';
     class function initWithFunc(afunc: TWSTimerProc): TCocoaTimerObject; message 'initWithFunc:';
   end;
@@ -66,9 +66,9 @@ type
   private
     FTerminating: Boolean;
 
-    pool      : NSAutoreleasePool;
-    FNSApp    : NSApplication;
-    delegate  : TCocoaAppDelegate;
+    pool: NSAutoreleasePool;
+    FNSApp: NSApplication;
+    delegate: TCocoaAppDelegate;
   protected
     FStockNullBrush: HBRUSH;
     FStockBlackBrush: HBRUSH;
@@ -86,6 +86,9 @@ type
 
     function GetAppHandle: THandle; override;
   public
+    // post message/ send message string
+    NSMessageWnd, NSMessageMsg, NSMessageWParam, NSMessageLParam, NSMessageResult: NSString;
+
     constructor Create; override;
     destructor Destroy; override;
 
@@ -106,6 +109,9 @@ type
 
     function CreateTimer(Interval: integer; TimerFunc: TWSTimerProc): THandle; override;
     function DestroyTimer(TimerHandle: THandle): boolean; override;
+    function PrepareUserEventInfo(Handle: HWND; Msg: Cardinal; wParam: WParam;
+      lParam: LParam): NSMutableDictionary;
+    function PrepareUserEvent(Handle: HWND; Info: NSDictionary): NSEvent;
 
     procedure InitStockItems;
     procedure FreeStockItems;
diff --git a/lcl/interfaces/cocoa/cocoaobject.inc b/lcl/interfaces/cocoa/cocoaobject.inc
index f7e1cf12fa..87c7a2e3e3 100644
--- a/lcl/interfaces/cocoa/cocoaobject.inc
+++ b/lcl/interfaces/cocoa/cocoaobject.inc
@@ -64,7 +64,7 @@ end;
  ------------------------------------------------------------------------------}
 procedure TCocoaWidgetSet.AppProcessMessages;
 var
-  event : NSEvent;
+  event: NSEvent;
 begin
   {$IFDEF VerboseObject}
     DebugLn('TCocoaWidgetSet.AppProcessMessages');
@@ -106,7 +106,14 @@ begin
   FTerminating := False;
 
   {  Creates the AutoreleasePool }
-  pool := NSAutoreleasePool(NSAutoreleasePool.alloc).init;
+  pool := NSAutoreleasePool.alloc.init;
+
+  NSMessageWnd := NSStringUTF8('HWND');
+  NSMessageMsg := NSStringUTF8('MSG');
+  NSMessageWParam := NSStringUTF8('WPARAM');
+  NSMessageLParam := NSStringUTF8('LPARAM');
+  NSMessageResult := NSStringUTF8('RESULT');
+
   InitStockItems;
 end;
 
@@ -265,6 +272,59 @@ begin
   NSTimer(obj).invalidate;
 end;
 
+function TCocoaWidgetSet.PrepareUserEventInfo(Handle: HWND; Msg: Cardinal;
+  wParam: WParam; lParam: LParam): NSMutableDictionary;
+var
+  LocalPool: NSAutoReleasePool;
+  Keys, Objs: NSMutableArray;
+begin
+  // create a dinctionary
+  LocalPool := NSAutoReleasePool.alloc.init;
+  Keys := NSMutableArray.arrayWithObjects(
+    NSMessageWnd,
+    NSMessageMsg,
+    NSMessageWParam,
+    NSMessageLParam,
+    NSMessageResult,
+    nil);
+  Objs := NSMutableArray.arrayWithObjects(
+    NSNumber.numberWithUnsignedInteger(Handle),
+    NSNumber.numberWithUnsignedLong(Msg),
+    NSNumber.numberWithInteger(wParam),
+    NSNumber.numberWithInteger(lParam),
+    NSNumber.numberWithInteger(0),
+    nil);
+  Result := NSMutableDictionary.dictionaryWithObjects_forKeys(Objs, Keys);
+  Result.retain;
+  // release everything
+  LocalPool.release;
+end;
+
+function TCocoaWidgetSet.PrepareUserEvent(Handle: HWND; Info: NSDictionary): NSEvent;
+var
+  Obj: NSObject;
+  Win: NSWindow;
+begin
+  Obj := NSObject(Handle);
+  if Obj.isKindOfClass(NSWindow) then
+    Win := NSWindow(Obj)
+  else
+  if Obj.isKindOfClass(NSView) then
+    Win := NSView(Handle).window
+  else
+    Exit(nil);
+  Result := NSEvent.otherEventWithType_location_modifierFlags_timestamp_windowNumber_context_subtype_data1_data2(
+    NSApplicationDefined,
+    NSZeroPoint,
+    0,
+    GetCurrentEventTime,
+    Win.windowNumber,
+    nil,
+    LCLEventSubTypeMessage,
+    NSInteger(Info),
+    0);
+end;
+
 procedure TCocoaWidgetSet.InitStockItems;
 var
   LogBrush: TLogBrush;
diff --git a/lcl/interfaces/cocoa/cocoaprivate.pp b/lcl/interfaces/cocoa/cocoaprivate.pp
index c08e8bbb8e..9f479859fc 100644
--- a/lcl/interfaces/cocoa/cocoaprivate.pp
+++ b/lcl/interfaces/cocoa/cocoaprivate.pp
@@ -36,6 +36,24 @@ uses
   LCLType;
 
 type
+  { ICommonCallback }
+
+  ICommonCallback = interface
+    // mouse events
+    procedure MouseDown(x,y: Integer);
+    procedure MouseUp(x,y: Integer);
+    procedure MouseClick(ClickCount: Integer);
+    procedure MouseMove(x,y: Integer);
+    // size,pos events
+    procedure frameDidChange;
+    procedure boundsDidChange;
+    // misc events
+    function DeliverMessage(Msg: Cardinal; WParam: WParam; LParam: LParam): LResult;
+    procedure Draw(ctx: NSGraphicsContext; const bounds, dirty: NSRect);
+    function GetPropStorage: TStringList;
+    function ResetCursorRects: Boolean;
+  end;
+
   { LCLObjectExtension }
 
   LCLObjectExtension = objccategory(NSObject)
@@ -53,7 +71,9 @@ type
     function lclFrame: TRect; message 'lclFrame';
     procedure lclSetFrame(const r: TRect); message 'lclSetFrame:';
     function lclClientFrame: TRect; message 'lclClientFrame';
+    function lclGetCallback: ICommonCallback; message 'lclGetCallback';
     function lclGetPropStorage: TStringList; message 'lclGetPropStorage';
+    function lclDeliverMessage(Msg: Cardinal; WParam: WParam; LParam: LParam): LResult; message 'lclDeliverMessage:::';
   end;
 
   { LCLViewExtension }
@@ -97,23 +117,6 @@ type
     function lclClientFrame: TRect; message 'lclClientFrame'; reintroduce;
   end;
 
-  { ICommonCallback }
-
-  ICommonCallback = interface
-    // mouse events
-    procedure MouseDown(x,y: Integer);
-    procedure MouseUp(x,y: Integer);
-    procedure MouseClick(ClickCount: Integer);
-    procedure MouseMove(x,y: Integer);
-    // size,pos events
-    procedure frameDidChange;
-    procedure boundsDidChange;
-    // misc events
-    procedure Draw(ctx: NSGraphicsContext; const bounds, dirty: NSRect);
-    function GetPropStorage: TStringList;
-    function ResetCursorRects: Boolean;
-  end;
-
   { IButtonCallback }
 
   IButtonCallback = interface(ICommonCallback)
@@ -156,7 +159,7 @@ type
     callback: IButtonCallback;
     function initWithFrame(frameRect: NSRect): id; override;
     function acceptsFirstResponder: Boolean; override;
-    function lclGetPropStorage: TStringList; override;
+    function lclGetCallback: ICommonCallback; override;
     procedure mouseDown(event: NSEvent); override;
     procedure mouseDragged(event: NSEvent); override;
     procedure mouseEntered(event: NSEvent); override;
@@ -171,7 +174,7 @@ type
   TCocoaTextField = objcclass(NSTextField)
     callback: ICommonCallback;
     function acceptsFirstResponder: Boolean; override;
-    function lclGetPropStorage: TStringList; override;
+    function lclGetCallback: ICommonCallback; override;
     procedure resetCursorRects; override;
   end;
 
@@ -189,7 +192,7 @@ type
   TCocoaTextView = objcclass(NSTextView)
     callback: ICommonCallback;
     function acceptsFirstResponder: Boolean; override;
-    function lclGetPropStorage: TStringList; override;
+    function lclGetCallback: ICommonCallback; override;
     procedure resetCursorRects; override;
   end;
 
@@ -206,13 +209,14 @@ type
   public
     callback: IWindowCallback;
     function acceptsFirstResponder: Boolean; override;
-    function lclGetPropStorage: TStringList; override;
+    function lclGetCallback: ICommonCallback; override;
     procedure mouseUp(event: NSEvent); override;
     procedure mouseDown(event: NSEvent); override;
     procedure mouseDragged(event: NSEvent); override;
     procedure mouseEntered(event: NSEvent); override;
     procedure mouseExited(event: NSEvent); override;
     procedure mouseMoved(event: NSEvent); override;
+    procedure sendEvent(event: NSEvent); override;
   end;
 
   { TCocoaCustomControl }
@@ -220,7 +224,7 @@ type
   TCocoaCustomControl = objcclass(NSControl)
     callback: ICommonCallback;
     procedure drawRect(dirtyRect: NSRect); override;
-    function lclGetPropStorage: TStringList; override;
+    function lclGetCallback: ICommonCallback; override;
     procedure mouseDown(event: NSEvent); override;
     procedure mouseDragged(event: NSEvent); override;
     procedure mouseEntered(event: NSEvent); override;
@@ -234,7 +238,7 @@ type
 
   TCocoaScrollView = objcclass(NSScrollView)
     callback: ICommonCallback;
-    function lclGetPropStorage: TStringList; override;
+    function lclGetCallback: ICommonCallback; override;
     procedure resetCursorRects; override;
   end;
 
@@ -271,7 +275,7 @@ type
     function numberOfItemsInComboBox(combo: TCocoaComboBox): NSInteger;
       message 'numberOfItemsInComboBox:';
     procedure dealloc; override;
-    function lclGetPropStorage: TStringList; override;
+    function lclGetCallback: ICommonCallback; override;
     procedure resetCursorRects; override;
     procedure comboBoxWillPopUp(notification: NSNotification); message 'comboBoxWillPopUp:';
     procedure comboBoxWillDismiss(notification: NSNotification); message 'comboBoxWillDismiss:';
@@ -283,7 +287,7 @@ type
 
   TCocoaScrollBar = objcclass(NSScroller)
     callback: ICommonCallback;
-    function lclGetPropStorage: TStringList; override;
+    function lclGetCallback: ICommonCallback; override;
     procedure resetCursorRects; override;
   end;
 
@@ -305,7 +309,7 @@ type
     callback: ICommonCallback;
     list: TCocoaStringList;
     resultNS: NSString;  //use to return values to combo
-    function lclGetPropStorage: TStringList; override;
+    function lclGetCallback: ICommonCallback; override;
     function numberOfRowsInTableView(aTableView: NSTableView): NSInteger; message 'numberOfRowsInTableView:';
     function tableView_objectValueForTableColumn_row(tableView: NSTableView;
       objectValueForTableColumn: NSTableColumn; row: NSInteger):id;
@@ -318,17 +322,20 @@ type
 
   TCocoaGroupBox = objcclass(NSBox)
     callback: ICommonCallback;
-    function lclGetPropStorage: TStringList; override;
+    function lclGetCallback: ICommonCallback; override;
     procedure resetCursorRects; override;
   end;
 
 implementation
 
+uses
+  CocoaInt;
+
 { TCocoaScrollView }
 
-function TCocoaScrollView.lclGetPropStorage: TStringList;
+function TCocoaScrollView.lclGetCallback: ICommonCallback;
 begin
-  Result := callback.GetPropStorage;
+  Result := callback;
 end;
 
 procedure TCocoaScrollView.resetCursorRects;
@@ -339,9 +346,9 @@ end;
 
 { TCocoaScrollBar }
 
-function TCocoaScrollBar.lclGetPropStorage: TStringList;
+function TCocoaScrollBar.lclGetCallback: ICommonCallback;
 begin
-  Result := callback.GetPropStorage;
+  Result := callback;
 end;
 
 procedure TCocoaScrollBar.resetCursorRects;
@@ -352,9 +359,9 @@ end;
 
 { TCocoaGroupBox }
 
-function TCocoaGroupBox.lclGetPropStorage: TStringList;
+function TCocoaGroupBox.lclGetCallback: ICommonCallback;
 begin
-  Result := callback.GetPropStorage;
+  Result := callback;
 end;
 
 procedure TCocoaGroupBox.resetCursorRects;
@@ -400,9 +407,9 @@ begin
   Result := True;
 end;
 
-function TCocoaButton.lclGetPropStorage: TStringList;
+function TCocoaButton.lclGetCallback: ICommonCallback;
 begin
-  Result := callback.GetPropStorage;
+  Result := callback;
 end;
 
 procedure TCocoaButton.mouseUp(event: NSEvent);
@@ -453,12 +460,12 @@ end;
 
 function TCocoaTextField.acceptsFirstResponder: Boolean;
 begin
-  Result:=true;
+  Result := True;
 end;
 
-function TCocoaTextField.lclGetPropStorage: TStringList;
+function TCocoaTextField.lclGetCallback: ICommonCallback;
 begin
-  Result := callback.GetPropStorage;
+  Result := callback;
 end;
 
 procedure TCocoaTextField.resetCursorRects;
@@ -474,12 +481,12 @@ end;
 
 function TCocoaTextView.acceptsFirstResponder: Boolean;
 begin
-  Result:=true;
+  Result := True;
 end;
 
-function TCocoaTextView.lclGetPropStorage: TStringList;
+function TCocoaTextView.lclGetCallback: ICommonCallback;
 begin
-  Result := callback.GetPropStorage;
+  Result := callback;
 end;
 
 procedure TCocoaTextView.resetCursorRects;
@@ -529,9 +536,9 @@ begin
   Result := True;
 end;
 
-function TCocoaWindow.lclGetPropStorage: TStringList;
+function TCocoaWindow.lclGetCallback: ICommonCallback;
 begin
-  Result := callback.GetPropStorage;
+  Result := callback;
 end;
 
 procedure TCocoaWindow.mouseUp(event: NSEvent);
@@ -574,6 +581,39 @@ begin
   inherited mouseMoved(event);
 end;
 
+procedure TCocoaWindow.sendEvent(event: NSEvent);
+var
+  Message: NSMutableDictionary;
+  Handle: HWND;
+  Msg: Cardinal;
+  WP: WParam;
+  LP: LParam;
+  Result: NSNumber;
+  Obj: NSObject;
+begin
+  if event.type_ = NSApplicationDefined then
+  begin
+    // event which we get through PostMessage or SendMessage
+    if event.subtype = LCLEventSubTypeMessage then
+    begin
+      // extract message data
+      Message := NSMutableDictionary(event.data1);
+      Handle := NSNumber(Message.objectForKey(CocoaWidgetSet.NSMessageWnd)).unsignedIntegerValue;
+      Msg := NSNumber(Message.objectForKey(CocoaWidgetSet.NSMessageMsg)).unsignedLongValue;
+      WP := NSNumber(Message.objectForKey(CocoaWidgetSet.NSMessageWParam)).integerValue;
+      LP := NSNumber(Message.objectForKey(CocoaWidgetSet.NSMessageLParam)).integerValue;
+      // deliver message and set result
+      Obj := NSObject(Handle);
+      // todo: check that Obj is still a valid NSView/NSWindow
+      Result := NSNumber.numberWithInteger(Obj.lclDeliverMessage(Msg, WP, LP));
+      Message.setObject_forKey(Result, CocoaWidgetSet.NSMessageResult);
+      Result.release;
+    end;
+  end
+  else
+    inherited sendEvent(event);
+end;
+
 procedure TCocoaWindow.mouseEntered(event: NSEvent);
 begin
   inherited mouseEntered(event);
@@ -605,9 +645,9 @@ begin
   callback.Draw(NSGraphicsContext.currentContext, bounds, dirtyRect);
 end;
 
-function TCocoaCustomControl.lclGetPropStorage: TStringList;
+function TCocoaCustomControl.lclGetCallback: ICommonCallback;
 begin
-  Result := callback.GetPropStorage;
+  Result := callback;
 end;
 
 procedure TCocoaCustomControl.mouseDown(event: NSEvent);
@@ -709,11 +749,33 @@ begin
   FillChar(Result, sizeof(Result), 0);
 end;
 
-function LCLObjectExtension.lclGetPropStorage: TStringList;
+function LCLObjectExtension.lclGetCallback: ICommonCallback;
 begin
   Result := nil;
 end;
 
+function LCLObjectExtension.lclGetPropStorage: TStringList;
+var
+  Callback: ICommonCallback;
+begin
+  Callback := lclGetCallback;
+  if Assigned(Callback) then
+    Result := Callback.GetPropStorage
+  else
+    Result := nil;
+end;
+
+function LCLObjectExtension.lclDeliverMessage(Msg: Cardinal; WParam: WParam; LParam: LParam): LResult;
+var
+  Callback: ICommonCallback;
+begin
+  Callback := lclGetCallback;
+  if Assigned(Callback) then
+    Result := Callback.DeliverMessage(Msg, WParam, LParam)
+  else
+    Result := 0;
+end;
+
 { LCLControlExtension }
 
 function RectToViewCoord(view: NSView; const r: TRect): NSRect;
@@ -939,9 +1001,9 @@ end;
 
 { TCocoaListView }
 
-function TCocoaListView.lclGetPropStorage: TStringList;
+function TCocoaListView.lclGetCallback: ICommonCallback;
 begin
-  Result := callback.GetPropStorage;
+  Result := callback;
 end;
 
 function TCocoaListView.numberOfRowsInTableView(aTableView:NSTableView): NSInteger;
@@ -1035,9 +1097,9 @@ begin
   inherited dealloc;
 end;
 
-function TCocoaComboBox.lclGetPropStorage: TStringList;
+function TCocoaComboBox.lclGetCallback: ICommonCallback;
 begin
-  Result := callback.GetPropStorage;
+  Result := callback;
 end;
 
 procedure TCocoaComboBox.resetCursorRects;
diff --git a/lcl/interfaces/cocoa/cocoautils.pas b/lcl/interfaces/cocoa/cocoautils.pas
index 65ababcd79..c8d2207507 100644
--- a/lcl/interfaces/cocoa/cocoautils.pas
+++ b/lcl/interfaces/cocoa/cocoautils.pas
@@ -9,6 +9,9 @@ uses
   MacOSAll, CocoaAll,
   Types, LCLType;
 
+const
+  LCLEventSubTypeMessage = MaxShort - 1;
+
 type
   { NSLCLDebugExtension }
 
diff --git a/lcl/interfaces/cocoa/cocoawinapi.inc b/lcl/interfaces/cocoa/cocoawinapi.inc
index 477325a050..1c19cea75a 100644
--- a/lcl/interfaces/cocoa/cocoawinapi.inc
+++ b/lcl/interfaces/cocoa/cocoawinapi.inc
@@ -46,6 +46,31 @@ const
  { crt_Complex   } COMPLEXREGION
   );
 
+function TCocoaWidgetSet.Arc(DC: HDC; Left, Top, Right, Bottom, angle1,
+  angle2: Integer): Boolean;
+begin
+  Result:=inherited Arc(DC, Left, Top, Right, Bottom, angle1, angle2);
+end;
+
+function TCocoaWidgetSet.AngleChord(DC: HDC; x1, y1, x2, y2, angle1,
+  angle2: Integer): Boolean;
+begin
+  Result:=inherited AngleChord(DC, x1, y1, x2, y2, angle1, angle2);
+end;
+
+function TCocoaWidgetSet.BeginPaint(Handle: hWnd; var PS: TPaintStruct): hdc;
+begin
+  Result := inherited BeginPaint(Handle, PS);
+  PS.hdc := Result;
+end;
+
+function TCocoaWidgetSet.BitBlt(DestDC: HDC; X, Y, Width, Height: Integer;
+  SrcDC: HDC; XSrc, YSrc: Integer; Rop: DWORD): Boolean;
+begin
+  Result := StretchMaskBlt(DestDC, X, Y, Width, Height, SrcDC, XSrc, YSrc,
+    Width, Height, 0, 0, 0, Rop);
+end;
+
 function TCocoaWidgetSet.ClientToScreen(Handle: HWND; var P: TPoint): Boolean;
 begin
   Result := Handle <> 0;
@@ -337,6 +362,11 @@ begin
     NSObject(hWnd).lclSetEnabled(bEnable)
 end;
 
+function TCocoaWidgetSet.EndPaint(Handle: hwnd; var PS: TPaintStruct): Integer;
+begin
+  Result:=inherited EndPaint(Handle, PS);
+end;
+
 function TCocoaWidgetSet.EnumFontFamiliesEx(DC: HDC; lpLogFont: PLogFont;
   Callback: FontEnumExProc; Lparam: LParam; Flags: dword): longint;
 var
@@ -1115,6 +1145,23 @@ begin
   Result:=True;
 end;
 
+function TCocoaWidgetSet.PostMessage(Handle: HWND; Msg: Cardinal;
+  wParam: WParam; lParam: LParam): Boolean;
+var
+  Info: NSDictionary;
+  Event: NSEvent;
+begin
+  Result := Handle <> 0;
+  if Result then
+  begin
+    Info := PrepareUserEventInfo(Handle, Msg, WParam, LParam);
+    // if we will want a postmessage using notification center
+    // NSDistributedNotificationCenter.defaultCenter.postNotificationName_object_userInfo_deliverImmediately(NSMessageNotification, nil, Info, False);
+    Event := PrepareUserEvent(Handle, Info);
+    NSApp.postEvent_atStart(Event, False);
+  end;
+end;
+
 function TCocoaWidgetSet.Rectangle(DC: HDC; X1, Y1, X2, Y2: Integer): Boolean;
 var
   ctx: TCocoaContext;
@@ -1324,6 +1371,21 @@ begin
   {$ENDIF}
 end;
 
+function TCocoaWidgetSet.SendMessage(Handle: HWND; Msg: Cardinal;
+  WParam: WParam; LParam: LParam): LResult;
+var
+  Info: NSDictionary;
+  Event: NSEvent;
+begin
+  if Handle <> 0 then
+  begin
+    Info := PrepareUserEventInfo(Handle, Msg, WParam, LParam);
+    Event := PrepareUserEvent(Handle, Info);
+    NSApp.sendEvent(Event);
+    Result := NSNumber(Info.objectForKey(NSMessageResult)).integerValue;
+  end;
+end;
+
 function TCocoaWidgetSet.SetActiveWindow(Handle: HWND): HWND;
 var
   Obj: NSObject;
diff --git a/lcl/interfaces/cocoa/cocoawinapih.inc b/lcl/interfaces/cocoa/cocoawinapih.inc
index d0a4150544..fc93a922a3 100644
--- a/lcl/interfaces/cocoa/cocoawinapih.inc
+++ b/lcl/interfaces/cocoa/cocoawinapih.inc
@@ -27,13 +27,13 @@
 
 //##apiwiz##sps##   // Do not remove, no wizard declaration before this line
 
-//function Arc(DC: HDC; Left,Top,Right,Bottom,angle1,angle2 : Integer): Boolean; override;
-//function AngleChord(DC: HDC; x1, y1, x2, y2, angle1, angle2: Integer): Boolean; override;
+function Arc(DC: HDC; Left,Top,Right,Bottom,angle1,angle2 : Integer): Boolean; override;
+function AngleChord(DC: HDC; x1, y1, x2, y2, angle1, angle2: Integer): Boolean; override;
 
-{function BeginPaint(Handle: hWnd; Var PS : TPaintStruct) : hdc; override;
+function BeginPaint(Handle: hWnd; Var PS : TPaintStruct) : hdc; override;
 function BitBlt(DestDC: HDC; X, Y, Width, Height: Integer; SrcDC: HDC; XSrc, YSrc: Integer; Rop: DWORD): Boolean; override;
 
-function CallNextHookEx(hHk: HHOOK; ncode : Integer; wParam: WParam; lParam : LParam) : Integer; override;
+{function CallNextHookEx(hHk: HHOOK; ncode : Integer; wParam: WParam; lParam : LParam) : Integer; override;
 function CallWindowProc(lpPrevWndFunc : TFarProc; Handle : HWND; Msg : UINT; wParam: WParam; lParam : lParam) : Integer; override;}
 function ClientToScreen(Handle: HWND; var P: TPoint) : Boolean; override;
 {
@@ -74,7 +74,7 @@ function DrawEdge(DC: HDC; var Rect: TRect; edge: Cardinal; grfFlags: Cardinal):
 function Ellipse(DC: HDC; x1, y1, x2, y2: Integer): Boolean; override;
 {function EnableScrollBar(Wnd: HWND; wSBflags, wArrows: Cardinal): Boolean; override;}
 function EnableWindow(hWnd: HWND; bEnable: Boolean): Boolean; override;
-{function EndPaint(Handle: hwnd; var PS: TPaintStruct): Integer; override;}
+function EndPaint(Handle: hwnd; var PS: TPaintStruct): Integer; override;
 procedure EnterCriticalSection(var CritSection: TCriticalSection); override;
 function EnumFontFamiliesEx(DC: HDC; lpLogFont: PLogFont; Callback: FontEnumExProc; Lparam: LParam; Flags: dword): longint; override;
 function EnumDisplayMonitors(hdc: HDC; lprcClip: PRect; lpfnEnum: MonitorEnumProc; dwData: LPARAM): LongBool; override;
@@ -150,7 +150,7 @@ function MoveWindowOrgEx(DC: HDC; dX, dY: Integer): Boolean; override;
 function PolyBezier(DC: HDC; Points: PPoint; NumPts: Integer; Filled, Continuous: boolean): boolean; override;}
 function Polygon(DC: HDC; Points: PPoint; NumPts: Integer; Winding: boolean): boolean; override;
 function Polyline(DC: HDC; Points: PPoint; NumPts: Integer): boolean; override;
-{function PostMessage(Handle: HWND; Msg: Cardinal; wParam: WParam; lParam: LParam): Boolean; override;}
+function PostMessage(Handle: HWND; Msg: Cardinal; wParam: WParam; lParam: LParam): Boolean; override;
 
 function Rectangle(DC: HDC; X1, Y1, X2, Y2: Integer): Boolean; override;
 function RectVisible(dc : hdc; const ARect: TRect) : Boolean; override;
@@ -163,7 +163,7 @@ function SaveDC(DC: HDC): Integer; override;
 function ScreenToClient(Handle: HWND; var P: TPoint): Integer; override;
 function SelectClipRGN(DC : hDC; RGN : HRGN) : Longint; override;
 function SelectObject(ADC: HDC; GDIObj: HGDIOBJ): HGDIOBJ; override;
-{function SendMessage(HandleWnd: HWND; Msg: Cardinal; WParam: WParam; LParam: LParam): LResult; override;}
+function SendMessage(Handle: HWND; Msg: Cardinal; WParam: WParam; LParam: LParam): LResult; override;
 function SetActiveWindow(Handle: HWND): HWND; override;
 function SetBKColor(DC: HDC; Color: TColorRef): TColorRef; override;
 function SetBkMode(DC: HDC; bkMode : Integer) : Integer; override;
diff --git a/lcl/interfaces/cocoa/cocoawscommon.pas b/lcl/interfaces/cocoa/cocoawscommon.pas
index 1a5f25d7f7..f687f51935 100644
--- a/lcl/interfaces/cocoa/cocoawscommon.pas
+++ b/lcl/interfaces/cocoa/cocoawscommon.pas
@@ -39,6 +39,7 @@ type
     procedure MouseMove(x,y: Integer); virtual;
     procedure frameDidChange; virtual;
     procedure boundsDidChange; virtual;
+    function DeliverMessage(Msg: Cardinal; WParam: WParam; LParam: LParam): LResult; virtual;
     procedure Draw(ControlContext: NSGraphicsContext; const bounds, dirty: NSRect); virtual;
     function ResetCursorRects: Boolean; virtual;
   end;
@@ -187,7 +188,7 @@ begin
       cy := NewBounds.Bottom - NewBounds.Top;
       flags := 0;
     end;
-    DeliverMessage(Target, PosMsg);
+    LCLMessageGlue.DeliverMessage(Target, PosMsg);
   finally
     Dispose(PosMsg.WindowPos);
   end;
@@ -225,6 +226,17 @@ begin
   end;
 end;
 
+function TLCLCommonCallback.DeliverMessage(Msg: Cardinal; WParam: WParam; LParam: LParam): LResult;
+var
+  Message: TLMessage;
+begin
+  Message.Msg := Msg;
+  Message.WParam := WParam;
+  Message.LParam := LParam;
+  Message.Result := 0;
+  Result := LCLMessageGlue.DeliverMessage(Target, Message);
+end;
+
 procedure TLCLCommonCallback.Draw(ControlContext: NSGraphicsContext;
   const bounds, dirty:NSRect);
 var