The TB_CHANGEBITMAP message changes the bitmap for a button in a toolbar.
TB_CHANGEBITMAP
wParam = (WPARAM) idButton;
lParam = (LPARAM) MAKELPARAM(iBitmap, 0);
Parameters
idButton
Command identifier of the button that is to receive a new bitmap.
iBitmap
Zero-based index of an image in the toolbar's image list. The system displays the specified image in the button.
Return Values
Returns TRUE if successful or FALSE otherwise.