Gets whether the Tile is actually checked. This is a dependency property.
true, if the Tile is checked; otherwise, false.
If the TileBase.AllowCheck property is set to True, the Tile can be displayed in the checked state (see TileBase.Checked). If the TileBase.AllowCheck property is set to Default or False, the Tile is not displayed checked even if the TileBase.Checked property equals true. The IsChecked property returns whether the Tile is actually displayed in the checked state.
When the IsChecked property value changes, the TileBase.CheckedChanged event is raised.