Two more wishes related to this:
1. Expressions like widthDock="Panel.Height.25" support only panel and album cover type. Can you support block type too?
2. If you use the following:
widthDock="Panel.Height.75" width="0" heightDock="Panel.Height.25" height="0"
it draws a square with each side length of "Panel.Height.25". Can you make it draw a non-square rectangle when different values are used?