title: Modifying FullScreen Design for ListPicker
body: <p>I've Been working with WP7 for a while, am using listPicker/DatePicker Heavily. i hate its design though.i use liskPicker's property ExpansionMode="FullScreenOnly". i tried to make those controls to look prettier by </p>
  
  <p>// Setting A source to the FullModeItemTemplate
  <code>FullModeItemTemplate="{StaticResource lpkFullItemTemplate}"</code></p>
  
  <p>//the definition for this Resource is as follows:</p>
  
  <pre><code>&lt;DataTemplate x:Name="lpkFullItemTemplate"&gt;
  &lt;StackPanel Orientation="Horizontal" Margin="5 5 5 5" Background="#FFA3A3A3" 
    Width="475" Height="45" &gt;
  &lt;TextBlock Text="{Binding}"  Foreground="Black" Margin="5 5 15 5"  /&gt;
  &lt;/StackPanel&gt;
  &lt;/DataTemplate&gt;
  </code></pre>
  
  <p>I need real changes, changing the background of that popup and such changes, is that possible? or i need to build my own popup from scratch?</p>