TB_CHECKBUTTON


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TB_CHECKBUTTON
TB_CHECKBUTTON 
    wParam = (WPARAM) idButton; 
    lParam = (LPARAM) MAKELONG(fCheck, 0); 
Checks or unchecks a given button in a toolbar.
Returns TRUE if successful, or FALSE otherwise.

idButton
Command identifier of the button to check.
fCheck
Check flag. If this parameter is TRUE, the check is added. If it is FALSE, the check is removed.

When a button is checked, it is displayed in the pressed state.

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