Member variable XbpToolBarButton():key Foundation
Specifies a key string that uniquely identifies a tool bar button.
The :key instance variable contains a character string that can be used to uniquely identify a button object within its XbpToolBar container. While the ordinal position of a tool bar may change as buttons are added or deleted at run time, a button's key string must be unique over the lifetime of the toolbar object. If an attempt is made to add a button with a duplicate key string, or if the key of an existing button is to be set to a duplicate value, a runtime value is generated.
The key string assigned to a given tool bar button can be specified using the <cKey> parameter to XbpToolBar:addItem(). Alternatively, a button's :key instance variable may be used to change its key string after it has already been added to an XbpToolBar instance.
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