The operations being signaled by the LayoutStartChanging / LayoutEndChanging events are:

• exSurfaceMove, the user scrolls or moves the surface. The AllowMoveSurface property specifies the keys combination to allow user to move / scroll the surface.
• exSurfaceZoom, the user magnifies or shrinks the surface. The AllowZoomSurface property specifies the keys combination to allow user to zoom the surface.
• exSurfaceHome, the user clicks the Home button on the control's toolbar, so the surface is restored to original position. The Home method has the same effect.
• exResizeObject, the user resizes the object. The AllowResizeObject property specifies the keys combination to allow user to resize the object.
• exMoveObject, the user moves the object. The AllowMoveObject property specifies the keys combination to allow user to move the object.
• exSelectObject, the user clicks the object to get it selected. The AllowSelectObject property specifies the keys combination to allow user to select the object.
• exSelectNothing, the user clicks an empty zone of the surface. The AllowSelectNothing property specifies the keys combination to allow user to select nothing on the surface.
• exCreateObject, the user creates an element on the surface. The AllowCreateObject property specifies the keys combination to allow user to create elements on the surface.
• exEditObject, the user edits the element's caption.
• exLinkObjects, the user creates an element on the surface. The AllowLinkObjects property specifies the keys combination to allow user to link elements on the surface.
• exFocusLink, the user clicks a link (the focused link is being updated). The FocusLink property retrieves or changes the current link that is currently focused (selected or active) within the control.
• exUndo, An Undo operation is performed (CTR + Z). Occurs only if the control's AllowUndoRedo property is True.
• exRedo, A Redo operation is performed  (CTR + Y). Occurs only if the control's AllowUndoRedo property is True.
• exUndoRedoUpdate, The Undo/Redo queue is updated. Occurs only if the control's AllowUndoRedo property is True.

For instance, the following events occur when user creates an element on the surface:

• LayoutStartChanging(exCreateObject), the user clicks on the surface
• AddElement, adds the new element to the Elements collection
• CreateElement, the user ends creating the object
• LayoutEndChanging(exCreateObject), the user un-clicks the surface

private void LayoutStartChanging(object sender,exontrol.EXSURFACELib.LayoutChangingEnum Operation)
{
}

Private Sub LayoutStartChanging(ByVal sender As System.Object,ByVal Operation As exontrol.EXSURFACELib.LayoutChangingEnum) Handles LayoutStartChanging
End Sub

private void LayoutStartChanging(object sender, AxEXSURFACELib._ISurfaceEvents_LayoutStartChangingEvent e)
{
}

void OnLayoutStartChanging(long Operation)
{
}

void __fastcall LayoutStartChanging(TObject *Sender,Exsurfacelib_tlb::LayoutChangingEnum Operation)
{
}

procedure LayoutStartChanging(ASender: TObject; Operation : LayoutChangingEnum);
begin
end;

procedure LayoutStartChanging(sender: System.Object; e: AxEXSURFACELib._ISurfaceEvents_LayoutStartChangingEvent);
begin
end;

begin event LayoutStartChanging(long Operation)
end event LayoutStartChanging

Private Sub LayoutStartChanging(ByVal sender As System.Object, ByVal e As AxEXSURFACELib._ISurfaceEvents_LayoutStartChangingEvent) Handles LayoutStartChanging
End Sub

Private Sub LayoutStartChanging(ByVal Operation As EXSURFACELibCtl.LayoutChangingEnum)
End Sub

Private Sub LayoutStartChanging(ByVal Operation As Long)
End Sub

LPARAMETERS Operation

PROCEDURE OnLayoutStartChanging(oSurface,Operation)
RETURN

<SCRIPT EVENT="LayoutStartChanging(Operation)" LANGUAGE="JScript">
</SCRIPT>

<SCRIPT LANGUAGE="VBScript">
Function LayoutStartChanging(Operation)
End Function
</SCRIPT>

Procedure OnComLayoutStartChanging OLELayoutChangingEnum llOperation
	Forward Send OnComLayoutStartChanging llOperation
End_Procedure

METHOD OCX_LayoutStartChanging(Operation) CLASS MainDialog
RETURN NIL

void onEvent_LayoutStartChanging(int _Operation)
{
}

function LayoutStartChanging as v (Operation as OLE::Exontrol.Surface.1::LayoutChangingEnum)
end function

function nativeObject_LayoutStartChanging(Operation)
return