The framework calls this method when it fills the background of an auto-hide button.
virtual void OnFillAutoHideButtonBackground(
   CDC* pDC,
   CRect rect,
   CMFCAutoHideButton* pButton
);
Parameters
- [in] pDC 
 A pointer to a device context.
- [in] rect 
 A rectangle that specifies the boundaries of the auto-hide button.
- [in] pButton 
 A pointer to a CMFCAutoHideButton object. The framework fills the background for this auto-hide button.
Remarks
Override this method in a derived visual manager to customize the appearance of an auto-hide button.
Requirements
Header: afxvisualmanager.h