Gets or sets the first item in the current selection or returns null if the selection is empty
Namespace:System.Windows.Controls.Primitives Assembly:PresentationFramework (in PresentationFramework.dll) XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation
If a Selector supports selecting a single item, the SelectedItem property returns the selected item. If a Selector supports multiple selections, SelectedItem returns the item that the user selected first.
Setting SelectedItem in a Selector that supports multiple selections clears existing selected items and sets the selection to the item specified.