Determine if any documents open in MDI

Hi gurus,
I'm new to writing a MDI program and was wondering how to determine if any documents are currently open from CMainFrame.
I need this because I am trying to disable a tool bar when the mainframe window is empty.

Also, which windows message do I need to use to know when the active document has changed?

Add an ON_UPDATE_COMMAND_UI handler for the toolbar item you want to disable and in the handler, do this:

Code:

---

void CMainFrame::OnUpdateYourToolBarButtonID(CCmdUI* pCmdUI)
{
        pCmdUI->Enable(NULL != MDIGetActive());
}

---

Hi,

After u change your document's content, call "UpdateAllViews". :)

Thanks a lot. works like a dream.