The Help Button is a control that the user can click to display the application help system.
The following screen shot illustrates the Ribbon Help Button.
The Ribbon framework defines a collection of property keys for the Help Button control.
Typically, a Help Button property is updated in the ribbon UI by invalidating the Command associated with the control through a call to the IUIFramework::InvalidateUICommand method. The invalidation event is handled, and the property updates defined, by the IUICommandHandler::UpdateProperty callback method.
The IUICommandHandler::UpdateProperty callback method is not executed, and the application queried for an updated property value, until the property is required by the framework. For example, when a tab is activated and a control revealed in the ribbon UI, or when a tooltip is displayed.
The following table lists the property keys that are associated with the Help Button control.
|UI_PKEY_Keytip||Can only be updated through invalidation.|
|UI_PKEY_Label||Can only be updated through invalidation.|
|UI_PKEY_TooltipDescription||Can only be updated through invalidation.|
|UI_PKEY_TooltipTitle||Can only be updated through invalidation.|