Returns whether or not this group box is collapsed.
        
        :return     <bool>

def isCollapsed( self ):
        """
        Returns whether or not this group box is collapsed.
        
        :return     <bool>
        """
        if not self.isCollapsible():
            return False
        
        if self._inverted:
            return self.isChecked()
        return not self.isChecked()