Parameters
- elt
 - the 
UIElementto be rotated, an element in the visual tree of thisPart - angle
 - a double between 0 and 360 degrees
 - focus
 - the spot of the rotation point; normally 
Spot.Center; any offset is ignored 
UIElement to be rotated, an element in the visual tree of this Part
Spot.Center; any offset is ignored
UIElement to be rotated, an element in the visual tree of this PartSpot.Center; any offset is ignoredRenderTransform that the element has, and gives it a new RotateTransform if needed.