How do I draw a rectangle with its height set to fill parent?
<p>I am trying to implement an indicator in an application that shows the volume level of an external device. For this I've created a Layout which is supposed to have Rectangle children being drawn runtime depending on the current volume of said device.</p>

<p>How do I go about accomplishing this? Specifically I wish to draw these rectangles with heights matching that of their parent.</p>
