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The Help Button is a control that the user can click to display the application help system.
Details
The following screen shot illustrates the Ribbon Help Button.
Help Button Properties
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.
Note
In some cases, a property can be retrieved through the IUIFramework::GetUICommandProperty method and set with the IUIFramework::SetUICommandProperty method.
The following table lists the property keys that are associated with the Help Button control.
| Property Key | Notes |
|---|---|
| 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. |
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