HOWTO: How To Disable Push Buttons on a DialogBar in MFC (152376)

SUMMARY

Push-button controls on a DialogBar cannot be disabled by calling EnableWindow. The following code has no effect:

   GetDlgItem(IDC_BUTTON1)->EnableWindow(FALSE);

This article describes how to implement push-button controls that can be disabled.

MORE INFORMATION

Controls on a DialogBar behave like the bitmaps on a Toolbar. They can be enabled or disabled by manually adding an ON_UPDATE_COMMAND_UI within the message map of the appropriate class (such as CMainFrame).

Step-by-Step Example

After you have placed a control on your DialogBar, such as a push-button with a resource ID of IDC_BUTTON1, use the following steps to manage the state of the control:

Within the declaration of your class, add the declaration for a handler function:
```
   afx_msg void OnUpdateButton1(CCmdUI* pCmdUI);
						
```

Within the implementation of your class, add a manual entry in the message map:

   BEGIN_MESSAGE_MAP(CMainFrame, CMDIFrameWnd)
       //{{AFX_MSG_MAP(CMainFrame)
       ...
       //}}AFX_MSG_MAP
       ON_UPDATE_COMMAND_UI(IDC_BUTTON1, OnUpdateButton1)
   END_MESSAGE_MAP()

Provide the definition of the handler function, as follows:

   void CMainFrame::OnUpdateButton1(CCmdUI* pCmdUI)
   {
       pCmdUI->Enable( TRUE );
   }