Why the UIEnable Event Does Not Exist for All Controls

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You can use the UIEnable event to specify user interface actions that should occur for an object or control when the Page control that contains it is activated or deactivated. There are three reasons a class of object does not contain this event:

• The class of object depends on its container object. This is the case with Column, Header, OptionButton, and Page controls, which are dependent, respectively, on the Grid, Column, OptionGroup, and PageFrame controls. The UIEnable event goes to the container for these objects.
• The class of object has no user interface. This is the case with the Custom and Timer objects. They have no user interface, so they do not receive UIEnable event notification.
• The class of object can not be contained within a page. This is the case with Form, _SCREEN, and Toolbar objects.