Defines the attached behavior that keeps the items of the Selector host control in synchronization with the IRegion. This behavior also makes sure that, if you activate a view in a region, the SelectedItem is set. If you set the SelectedItem or SelectedItems (ListBox) then this behavior will also call Activate on the selected items. When calling Activate on a view, you can only select a single active view at a time. By setting the SelectedItems property of a listbox, you can set multiple views to active.
Inheritance: RegionBehavior, IHostAwareRegionBehavior
        private SelectorItemsSourceSyncBehavior CreateBehavior()
        {
            Region region = new Region();
            Selector selector = new TabControl();

            var behavior = new SelectorItemsSourceSyncBehavior();
            behavior.HostControl = selector;
            behavior.Region = region;
            return behavior;
        }
        private SelectorItemsSourceSyncBehavior CreateBehavior()
        {
            Region region = new Region();
#if SILVERLIGHT
            Selector selector = new ComboBox();
#else
            Selector selector = new TabControl();
#endif
            var behavior = new SelectorItemsSourceSyncBehavior();
            behavior.HostControl = selector;
            behavior.Region = region;
            return behavior;
        }
        private static SelectorItemsSourceSyncBehavior CreateBehavior()
        {
            Region region = new Region();
#if SILVERLIGHT || NETFX_CORE
            Selector selector = new ComboBox();
#else
            Selector selector = new TabControl();
#endif
            var behavior = new SelectorItemsSourceSyncBehavior()
            {
                HostControl = selector,
                Region = region
            };
            return behavior;
        }