Forum

Can you please explain to me why the following code doesn’t work?

int buttonIndex = m_wndMainToolBar.CommandToIndex( ID_DONUTS);
CExtBarButton* pButton = m_wndMainToolBar.GetButton( buttonIndex);
if( static_cast<int>(wParam))
	pButton->ModifyStyle( 0, TBBS_DISABLED);
else
	pButton->ModifyStyle( TBBS_DISABLED, 0);
m_wndMainToolBar.Invalidate();

This code does not work because the toolbar is fully controlled by MFC’s command updating mechanism. The TBBS_DISABLED style of the toolbar button is used internally to remember the last command updating result. Please add command updating handler methods for the toolbar buttons which you need to disable/enable optionally.

oops... sorry, I think it does work. I just noticed that the button flickers, as if it’s being disabled and then reenabled. I’ll dig some more and will post up if I do find a problem.

As we mentioned in the previous answer, the TBBS_DISABLED button style is used just for keeping the last command updating result. Please do not change this flag explicitly and use command updating methods instead.