title: Fontsize does not increase after changing it in event handler.
body: <p>i found a solution for this matter but i have a difficulty in increasing the font size by giving it to a button click</p>
  
  <pre><code>private void ApplicationBarIconButton_Click_3(object sender, EventArgs e)
  {
      if (ScrollableTextBlock.FontSize &lt; 21.5)
      {
          ScrollableTextBlock.FontSize += 1;
      }
  }
  </code></pre>
  
  <p>this does not increase the text size  i'm using the same data template which is mentioned under the link:-<a href="http://blogs.msdn.com/b/priozersk/archive/2010/09/08/creating-scrollable-textblock-for-wp7.aspx" rel="nofollow">http://blogs.msdn.com/b/priozersk/archive/2010/09/08/creating-scrollable-textblock-for-wp7.aspx</a></p>