DialogBars Example
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This program displays a modal dialog containing a slider control, a Scrollbar
control and a progressbar control. These controls are attached to CWnd objects.
 

Features demonstrated in this example
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* Using a dialog as an application.
* Using a slider, scrollbar and progressbar control in a dialog. 
* Use of AttachDlgItem to attach a dialog control to a CWnd.
* Use of OnMessageReflect to handle notifications in the object that 
   generated them.