Operating Text Button Controls
When you set a text button control to any mode other than indicator mode, you can operate it from the keyboard or with the mouse.
You can operate a text button control from the keyboard by pressing the <spacebar> or <Enter> key to change the state of the button.
To operate a text button with the mouse, click the button to change its state.
If the control mode of the text button is hot or validate, a commit event is generated when the button is active and you change its state.