The TB_CHECKBUTTON message checks or unchecks a given button in a toolbar.
TB_CHECKBUTTON
wParam = (WPARAM) idButton;
lParam = (LPARAM) MAKELONG(fCheck, 0);
Parameters
idButton
Command identifier of the button to check.
fCheck
Check flag. If this parameter TRUE, the check is added. If it is FALSE, the check is removed.
Return Values
Returns TRUE if successful or FALSE otherwise.
Remarks
When a button has been checked, it appears to have been pressed.