BCGControlBar Pro for MFC
virtual BOOL CBCGPProp::OnEdit ( LPPOINT  lptClick)

Called by the framework when the user is about to edit a property value.

Should return TRUE if in-place editing of the property has started successfully; otherwise FALSE.

The default implementation creates an in-place edit control or combo box if the property value is editable.

lptClickSpecifies a point, in client coordinates, the user has clicked to begin editing.