When either component of the NavigationPaneFlyoutMaximumSize property is set to a specific, non-default value, the same component of the NavigationPaneFlyoutMaximumSizeResolved returns that same value. When either component of the NavigationPaneFlyoutMaximumSize property is left at its default value, the control uses a "best fit" value for the actual width or height; in that case, the NavigationPaneFlyoutMaximumSizeResolved property returns that value. The width component of the "best fit" value is virtually unlimited, i.e., the flyout can be sized as large as the screen resolution allows; the height component is defined by the current height of the control.
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