What is correct way to update custom dialogbars in document/view MDI architecture when the current document is deactivated or a new document is activated. I am currently trying to send messages to the CMainFrame:public CMDIFrameWnd when a CView is selected and sets a different active document. This does not take into account other ways in which the Active document might be set (I don't know hat these might be). CMainFrame can see all the dialog bars and should be the one to update them based on the active document when the active document is changed. I was looking for a simple OnActivateDocument() event, or something like it, in CMainFrame couldn't seem to find it. There has to be a simple way and I am just missing it.