MarkupObjects - More Ways To Measure

RelativeToParentLeft, RelativeToParentTop, RelativeToControlLeft, RelativeToControlTop, ActualWidth and ActualHeight properties for all markup objects is required (there may be better names for these properties, but I just used the most descriptive names I could think of).

Krog - please correct me if I am wrong about my assumptions (below) on these properties:

RelativeToParent* would return the number of pixels away from the parent MarkupObject the current object is. Essentially the sum of Parent Paddings and ObjectMargins.

RelativeToControl* would return the number of pixels away from the MarkupLabel control boundary. For example, calling MarkupStackPanel.RelativeToControlLeft would return the number of pixels between the leftmost point of the StackPanel and the left edge of the control (negatives allowed!)

Actual*- The actual width of the object in pixels (because stretching can dynamically set the dimensions of the object). This one is very important IMHO, so we can do things like dynamically resize the control to fit content.