The ActiveTile property can only be set directly when the control is expanded. Attempting to set this property when the control is collapsed causes an exception to be thrown.
When the control is collapsed, this property returns null.
The active tile is the tile with the keyboard focus. Tiles can be selected using the SelectedTiles collection.
A tile is activated when the user navigates to it via the keyboard.
This property returns null when the ApplicationBar has the input focus.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2