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Expert Activation


Some activatable elements, usually PushButtons and ToggleButtons, can have expert activation actions associated with them. BSelect Click 2 (that is, double-clicking the element) should activate any expert action for the element. Expert actions should only be available in a Panel of PushButtons or in a Panel of RadioButtons where one of the RadioButtons is always on. When the focus is on a button used for expert activation, there must be no default action available, unless the default and expert actions are the same.

The expert action should include the regular action of the component in a more global manner. For example, a Panel of RadioButtons in a drawing application could include a tool for turning on the erase cursor. Selecting the RadioButton turns on the erase cursor. Double-clicking the RadioButton could erase the drawing area.

If a component with an expert action is selectable, activating the expert action must first select the component and then perform the expert action.

To support new users and keyboard-only users, expert actions must only be shortcuts to application features available elsewhere.