In C# we can call Visual::TransformToAncestor, Visual::TransformToDescendant or Visual::TransformToVisual in order to get a transform to convert from one Visual local coordinates to another visual local coordinates. This methods return a GeneralTransform object which contains this:

public System.Windows.Point Transform (System.Windows.Point point);

In C++ these methods return a Matrix4 object, but it doesn't have any Transform method and I couldn't find any way to transform a point using them.