def check_button ( self, buttons, action ):
        name = action.name
        for button in buttons:
            if self.is_button( button, name ):
                return
        buttons.append( action )

    #---------------------------------------------------------------------------
    #  Check to see if a specified Action button is a 'system' button:
    #---------------------------------------------------------------------------
Adds *action* to the system buttons list for this dialog, if it is
dataset/ETHPy150Open enthought/traitsui/traitsui/wx/ui_base.py/BaseDialog.check_button