diff --git a/ide/aboutfrm.lfm b/ide/aboutfrm.lfm
index 7c6eed1b33..b9f6d1f82b 100644
--- a/ide/aboutfrm.lfm
+++ b/ide/aboutfrm.lfm
@@ -18,7 +18,7 @@ object AboutForm: TAboutForm
     Top = 0
     Width = 460
     Align = alClient
-    OnPageChanged = NotebookPageChanged
+    OnChange = NotebookPageChanged
     TabOrder = 0
     object VersionPage: TTabSheet
       Caption = 'Version'
diff --git a/ide/codeexplorer.lfm b/ide/codeexplorer.lfm
index 09f87aa54b..1779af9429 100644
--- a/ide/codeexplorer.lfm
+++ b/ide/codeexplorer.lfm
@@ -21,7 +21,7 @@ object CodeExplorerView: TCodeExplorerView
     BorderSpacing.Top = 2
     TabIndex = 0
     TabOrder = 0
-    OnPageChanged = MainNotebookPageChanged
+    OnChange = MainNotebookPageChanged
     object CodePage: TTabSheet
       Caption = 'CodePage'
       ClientHeight = 488
diff --git a/ide/codetoolsdefines.lfm b/ide/codetoolsdefines.lfm
index de88601f32..0d499c662d 100644
--- a/ide/codetoolsdefines.lfm
+++ b/ide/codetoolsdefines.lfm
@@ -83,7 +83,7 @@ object CodeToolsDefinesEditor: TCodeToolsDefinesEditor
       Align = alBottom
       Anchors = [akTop, akLeft, akRight, akBottom]
       BorderSpacing.Around = 6
-      OnPageChanged = ValueNoteBookPageChanged
+      OnChange = ValueNoteBookPageChanged
       TabOrder = 0
       object ValueAsTextPage: TTabSheet
         Caption = 'ValueAsTextPage'
diff --git a/ide/fpdoceditwindow.lfm b/ide/fpdoceditwindow.lfm
index d5b5e270e2..3bbc95cd03 100644
--- a/ide/fpdoceditwindow.lfm
+++ b/ide/fpdoceditwindow.lfm
@@ -24,7 +24,6 @@ object FPDocEditor: TFPDocEditor
     TabOrder = 0
     TabPosition = tpBottom
     OnChange = PageControlChange
-    OnPageChanged = PageControlChange
     object ShortTabSheet: TTabSheet
       Caption = 'ShortTabSheet'
       ClientHeight = 123
diff --git a/ide/initialsetupdlgs.lfm b/ide/initialsetupdlgs.lfm
index cf51d9bac8..01cb35d6e6 100644
--- a/ide/initialsetupdlgs.lfm
+++ b/ide/initialsetupdlgs.lfm
@@ -88,7 +88,6 @@ object InitialSetupDialog: TInitialSetupDialog
     TabIndex = 2
     TabOrder = 3
     OnChange = PropertiesPageControlChange
-    OnPageChanged = PropertiesPageControlChange
     Options = [nboHidePageListPopup]
     object LazarusTabSheet: TTabSheet
       Caption = 'LazarusTabSheet'
diff --git a/ide/searchresultview.lfm b/ide/searchresultview.lfm
index 92fc91b12b..f6ff65b481 100644
--- a/ide/searchresultview.lfm
+++ b/ide/searchresultview.lfm
@@ -24,7 +24,6 @@ object SearchResultsView: TSearchResultsView
     OnChange = ResultsNoteBookPageChanged
     OnCloseTabClicked = ResultsNoteBookClosetabclicked
     OnMouseDown = ResultsNoteBookMouseDown
-    OnPageChanged = ResultsNoteBookPageChanged
     Options = [nboShowCloseButtons, nboMultiLine]
   end
   object ToolBar: TToolBar