RibbonItemEnabled Property

public bool Enabled { get; set; }

Public Property Enabled As Boolean
	Get
	Set

public:
property bool Enabled {
	bool get ();
	void set (bool value);
}

member Enabled : bool with get, set

When the Enabled property is set to false, the item cannot be clicked, and the item's appearance changes. The Image and Text assigned to the item appear grayed out. For pushbuttons, the button may be enabled programmatically but be disabled in the user interface because of the Revit context; see the property IsEnabledByContext for RibbonButton.