How to dynamically fullsize a Canvas to a Dock-center?

Hi,

I have a canvas within the following layout:
DockLayoutPanel
 center
  ResizeLayoutPanel
   AbsolutePanel
    Canvas

How can I set the coordinateSpace height/width always according to the actual size? How can I get the center size of the dock when creating the canvas?

I thought I could just walk up the parent tree from the canvas and get the clientwidth, but it is always = 0
canvas.getElement().getParentElement().getParentElement().getParentElement().getClientWidth()

What is wrong here?

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