Figure 41 shows the standard Boolean controls, the check box, radio button and toggle button.
The check box and radio button can only adopt one label whereas the toggle button can adopt two (similar to the push button).
Since these controls are Boolean controls, you can use the same Boolean control state class in either control.
A Boolean control state can have one of three values, kUnknown, kFalse or kTrue. Figure 41 illustrates these values.
You can use Boolean control groups to group Boolean controls for mutual exclusion. See "Boolean control groups."
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