Get geometry back using binding

Tell me how to act in such a situation ... There is a User Control, inside it lies a rectangle , WITHOUT a name . So how can I get a Geometry Rectangle 'but without a name, for example, from the main form of the program? I used to cope with:

Code in user control:

 public Geometry retgeometry() { return (myfavouriterectangle.RenderedGeometry); // myfavouriterectangle - это название того самого rectangle'а из которого мы должны получить Geometry } 

The code in the program itself:

 var controlgeometry = uiusercontrol.retgeometry(); 

And now you need to get rid of Name and now I remembered about a good thing like Binding .

UPD : @VladD that's what ...

  var g = tb.retgeometry(); g.Transform = (Transform)tb.TransformToAncestor(canvas); var m = (myui as uiusercontrol).retgeometry(); m.Transform = (Transform)(myui as uiusercontrol).TransformToAncestor(canvas); IntersectionDetail khg = m.FillContainsWithDetail(g);