diff --git a/lcl/include/application.inc b/lcl/include/application.inc
index edbbc816b8..109af908cc 100644
--- a/lcl/include/application.inc
+++ b/lcl/include/application.inc
@@ -416,13 +416,20 @@ end;
   TApplication ProcesssMessages  "Enter the messageloop and process until empty"
 ------------------------------------------------------------------------------}
 procedure TApplication.ProcessMessages;
+var
+  context: TLCLHandle;
 begin
   if Self=nil then begin
     // when the programmer did a mistake, avoid getting strange errors
     raise Exception.Create('Application=nil');
   end;
-  WidgetSet.AppProcessMessages;
-  ProcessAsyncCallQueue;
+  context := WidgetSet.BeginMessageProcess;
+  try
+    WidgetSet.AppProcessMessages;
+    ProcessAsyncCallQueue;
+  finally
+    WidgetSet.EndMessageProcess(context);
+  end;
 end;
 
 {------------------------------------------------------------------------------
@@ -1267,9 +1274,16 @@ end;
   Handles all messages first then the Idle
  ------------------------------------------------------------------------------}
 procedure TApplication.HandleMessage;
+var
+  context: TLCLHandle;
 begin
-  WidgetSet.AppProcessMessages; // process all events
-  if not Terminated then Idle(true);
+  context := WidgetSet.BeginMessageProcess;
+  try
+    WidgetSet.AppProcessMessages; // process all events
+    if not Terminated then Idle(true);
+  finally
+    WidgetSet.EndMessageProcess(context);
+  end;
 end;
 
 function TApplication.HelpContext(Context: THelpContext): Boolean;
diff --git a/lcl/include/interfacebase.inc b/lcl/include/interfacebase.inc
index 0608326c5c..b27c4e208e 100644
--- a/lcl/include/interfacebase.inc
+++ b/lcl/include/interfacebase.inc
@@ -84,6 +84,15 @@ procedure TWidgetSet.AppSetupMainForm(AMainForm: TObject);   //e.g. handle widge
 begin
 end;
 
+function  TWidgetSet.BeginMessageProcess: TLCLHandle;
+begin
+  Result := 0;
+end;
+
+procedure TWidgetSet.EndMessageProcess(context: TLCLHandle);
+begin
+end;
+
 function TWidgetSet.GetLCLCapability(ACapability: TLCLCapability): PtrUInt;
 begin
   case ACapability of
diff --git a/lcl/interfacebase.pp b/lcl/interfacebase.pp
index f3bae3db07..657d9616c0 100644
--- a/lcl/interfacebase.pp
+++ b/lcl/interfacebase.pp
@@ -147,7 +147,14 @@ type
     function AppRestoreStayOnTopFlags(const ASystemTopAlso: Boolean = False): Boolean; virtual;
     procedure AppSetMainFormOnTaskBar(const DoSet: Boolean); virtual;
     procedure AppSetupMainForm(AMainForm: TObject); virtual;
-    
+
+    // Begin/End processing messages, which can be used to acquire/release
+    // resources during message processing.
+    // for example, on Cocoa, it needs to be used to release AutoReleasePool
+    // to avoid resource leaks.
+    function  BeginMessageProcess: TLCLHandle; virtual;
+    procedure EndMessageProcess(context: TLCLHandle); virtual;
+
     function  LCLPlatform: TLCLPlatform; virtual; abstract;
     function  GetLCLCapability(ACapability: TLCLCapability): PtrUInt; virtual;
 
diff --git a/lcl/interfaces/cocoa/cocoaint.pas b/lcl/interfaces/cocoa/cocoaint.pas
index 1cc7421a56..54791ff416 100644
--- a/lcl/interfaces/cocoa/cocoaint.pas
+++ b/lcl/interfaces/cocoa/cocoaint.pas
@@ -201,6 +201,9 @@ type
     procedure AppSetIcon(const Small, Big: HICON); override;
     procedure AppSetTitle(const ATitle: string); override;
 
+    function BeginMessageProcess: TLCLHandle; override;
+    procedure EndMessageProcess(context: TLCLHandle); override;
+
     function  GetLCLCapability(ACapability: TLCLCapability): PtrUInt; override;
 
     function CreateTimer(Interval: integer; TimerFunc: TWSTimerProc): TLCLHandle; override;
@@ -296,6 +299,22 @@ const
   // Lack of documentation, provisional definition
   LazarusApplicationDefinedSubtypeWakeup = 13579;
 
+procedure InternalInit;
+begin
+  // MacOSX 10.6 reports a lot of warnings during initialization process
+  // adding the autorelease pool for the whole Cocoa widgetset
+  MainPool := NSAutoreleasePool.alloc.init;
+end;
+
+procedure InternalFinal;
+begin
+  if Assigned(MainPool) then
+  begin
+    MainPool.release;
+    MainPool := nil;
+  end;
+end;
+
 procedure wakeupEventLoop;
 var
   ev: NSevent;
@@ -476,6 +495,8 @@ end;
 {$ifdef COCOALOOPOVERRIDE}
 procedure TCocoaApplication.run;
 begin
+  InternalFinal;   // MainPool Stage 1 final
+  InternalInit;    // MainPool Stage 2 init
   {$ifdef COCOAPPRUNNING_SETINTPROPERTY}
   setValue_forKey(NSNumber.numberWithBool(true), NSSTR('_running'));
   {$endif}
@@ -743,22 +764,6 @@ begin
 end;
 {$endif}
 
-procedure InternalInit;
-begin
-  // MacOSX 10.6 reports a lot of warnings during initialization process
-  // adding the autorelease pool for the whole Cocoa widgetset
-  MainPool := NSAutoreleasePool.alloc.init;
-end;
-
-procedure InternalFinal;
-begin
-  if Assigned(MainPool) then
-  begin
-    MainPool.release;
-    MainPool := nil;
-  end;
-end;
-
 type
   AppClassMethod = objccategory external (NSObject)
     function sharedApplication: NSApplication; message 'sharedApplication';
@@ -939,9 +944,10 @@ begin
 end;
 
 initialization
+  InternalInit;   // MainPool Stage 1 init
 //  {$I Cocoaimages.lrs}
 
 finalization
-  InternalFinal;
+  InternalFinal;  // MainPool Stage 2 Final
 
 end.
diff --git a/lcl/interfaces/cocoa/cocoaobject.inc b/lcl/interfaces/cocoa/cocoaobject.inc
index afa6e5b5d6..686e4adf2c 100644
--- a/lcl/interfaces/cocoa/cocoaobject.inc
+++ b/lcl/interfaces/cocoa/cocoaobject.inc
@@ -31,8 +31,6 @@ begin
   {$IFDEF VerboseObject}
     DebugLn('TCocoaWidgetSet.AppInit');
   {$ENDIF}
-  InternalInit;
-
   WakeMainThread := @OnWakeMainThread;
   ScreenInfo.PixelsPerInchX := CocoaBasePPI;
   ScreenInfo.PixelsPerInchY := CocoaBasePPI;
@@ -124,6 +122,17 @@ begin
   AppRunMessages(true, NSDate.distantFuture);
 end;
 
+function TCocoaWidgetSet.BeginMessageProcess: TLCLHandle;
+begin
+  Result := TLCLHandle(NSAutoreleasePool.alloc.init);
+end;
+
+procedure TCocoaWidgetSet.EndMessageProcess(context: TLCLHandle);
+begin
+  NSAutoreleasePool(context).release;
+end;
+
+
 {------------------------------------------------------------------------------
   Method:  TCocoaWidgetSet.Create
 
diff --git a/lcl/interfaces/cocoa/cocoawsforms.pas b/lcl/interfaces/cocoa/cocoawsforms.pas
index 01e6082d3c..20834df316 100644
--- a/lcl/interfaces/cocoa/cocoawsforms.pas
+++ b/lcl/interfaces/cocoa/cocoawsforms.pas
@@ -852,6 +852,7 @@ begin
     // it should be removed from "parentWindow"
     if Assigned(win.parentWindow) then
       win.parentWindow.removeChildWindow(win);
+    win.setLevel(NSNormalWindowLevel);
     win.close;
     win.setContentView(nil);
     cb := win.lclGetCallback();