Sets the style of the toolbar button at the given index.
virtual void SetButtonStyle(
   int nIndex,
   UINT nStyle 
);
Parameters
- [in] nIndex 
 The zero-based index of the toolbar button whose style is to be set.
- [in] nStyle 
 The style of the button. See ToolBar Control Styles for the list of available toolbar button styles.
Remarks
This method removes the TBBS_PRESSED style if nStyle is TBBS_DISABLED because the user cannot click a disabled button.
Requirements
Header: afxtoolbar.h