Causes previously generated elements that are no longer in view to be 'un-generated' and removed from our parent children collection.
protected bool CleanupUnusedGeneratedElements()
'Declaration
Protected Function CleanupUnusedGeneratedElements() As Boolean
Return Value
True if more unused (i.e., invisible) elements remain to be cleaned up, false if all unused elements have been cleaned up
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, 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
