The effective value of this property is influenced by the relative positions of hit testable elements in the logical tree. For instance, if an element is a child element of an element that is not hit test visible, the effective value of the property on the child will remain false, even if attempting to set that value locally. For this reason, it is important that you do not set IsHitTestVisible to false on a composited control unless you do not want any input or hit testing on that control. For more information on hit testing, see Hit Testing in the Visual Layer.