ToolBar controls provide an overflow mechanism that places items that do not fit on the ToolBar into an overflow area. Only toolbar elements within a parent ToolBarTray can be moved or resized by the user.
Content Model: ToolBar is a HeaderedItemsControl. Its content properties are Items and ItemsSource, and its header property is Header. For more information on the content model for ToolBar, see Controls Content Model Overview.
Dependency properties for this control might be set by the control’s default style. If a property is set by a default style, the property might change from its default value when the control appears in the application. The default style is determined by which desktop theme is used when the application is running. For more information, see Themes.