title: Silverlight toolkit Expander doesn't expand when the size of its content changes
body: <p>I have a silverlight expander control which wraps a grid. In the grid, I have a number of text boxes, combo boxes as well as some invisable (collapsed) text blocks. I also have an animation and when it is triggered the grid shows those hidden text blocks.</p>
  
  <p>My problem is, when the hidden text blocks are shown after the animation is run, these text blocks push other controls down and because the expander doesn't resize itself, the controls at the bottom get pushed outside of the expander and become invisible.</p>
  
  <p>I tried to call UpdateLayout() after the SizeChanged event of the grid but doesn't work.</p>
  
  <p>Any suggestions on how to resolve this issue would be much appreciated!!</p>