title: grid inside scrollviewer in windows phone 7.1
body: <p>i need a registeration form within my application, i need scrolling so i did the following </p>
  
  <pre><code>&lt;ScrollViewer VerticalScrollBarVisibility="Visible" Height="780" MaxHeight="1800"
                    MaxWidth="477" VerticalAlignment="Top"&gt;
             &lt;ScrollViewer.Content&gt;
            &lt;Grid Width="477" Height="728"  MaxHeight="1800"&gt;  
                    &lt;!--   .......Form's Elements..... --&gt;
                   &lt;/Grid&gt;
        &lt;/ScrollViewer.Content&gt;
  &lt;/ScrollViewer&gt;
  </code></pre>
  
  <p>there is no scrolling, what am i missing?</p>