title: scrollviewer not working
body: <p>y my scrollviewer not scrolling till the end.it gets struck to a limited position.
  i hav attached my xaml code.i placed a canvas inside the code.and the scrollviewer is inside 2 grids. </p>
  
  <pre><code>&lt;ScrollViewer&gt;
      &lt;Canvas Margin="0,0,0,0"&gt;
          &lt;toolkit:ListPicker x:Name="listPicker"  ItemTemplate="{StaticResource PickerItemTemplate}" 
                      FullModeItemTemplate="{StaticResource PickerFullModeItemTemplate}"  CacheMode="BitmapCache"
                      Header="" Margin="12,246,210,298" FontFamily="Yu Gothic" FontSize="22" FontWeight="SemiBold" Width="240" /&gt;
  
          &lt;toolkit:ListPicker x:Name="listPicker2"  ItemTemplate="{StaticResource PickerItemTemplate}" ItemCountThreshold="3"
                      FullModeItemTemplate="{StaticResource PickerFullModeItemTemplate}"  CacheMode="BitmapCache"
                      Header=""  Margin="9,343,210,206" Width="240" /&gt;
          &lt;toolkit:ListPicker CacheMode="BitmapCache" FullModeItemTemplate="{StaticResource PickerFullModeItemTemplate}" Header="" ItemCountThreshold="3" ItemTemplate="{StaticResource PickerItemTemplate}" Margin="12,440,210,108" Name="listPicker1" Width="240" /&gt;
          &lt;toolkit:ListPicker CacheMode="BitmapCache" FullModeItemTemplate="{StaticResource PickerFullModeItemTemplate}" Header="" ItemCountThreshold="3" ItemTemplate="{StaticResource PickerItemTemplate}" Margin="11,546,210,2" Name="listPicker3" Width="240" /&gt;
  
          &lt;TextBlock Height="40" HorizontalAlignment="Left" Margin="30,212,0,0" Name="textBlock1" Text="MONTHLY DEBTS" VerticalAlignment="Top" Width="185" FontSize="24" /&gt;
          &lt;TextBlock Height="40" HorizontalAlignment="Left" Margin="290,212,0,0" Name="textBlock2" Text="AMOUNTS" VerticalAlignment="Top" Width="147" FontSize="24" /&gt;
  
          &lt;clrtb:ClearableTextBox Canvas.Left="246" Canvas.Top="242" Height="75" Name="qualifytb" Width="208" /&gt;
          &lt;clrtb:ClearableTextBox Canvas.Left="242" Canvas.Top="338" Height="75" Name="clearableTextBox1" Width="208" /&gt;
          &lt;clrtb:ClearableTextBox Canvas.Left="246" Canvas.Top="436" Height="75" Name="clearableTextBox2" Width="208" /&gt;
          &lt;clrtb:ClearableTextBox Canvas.Left="244" Canvas.Top="542" Height="75" Name="clearableTextBox3" Width="208" /&gt;
          &lt;TextBlock Text="DEBT RATIO" Canvas.Left="148" Canvas.Top="642" FontSize="26" FontWeight="Medium" /&gt;
          &lt;TextBlock Text="Conv Debt Ratio:" Canvas.Left="30" Canvas.Top="700" FontSize="26" FontWeight="Medium" /&gt;
          &lt;TextBlock Text="FHA Debt Ratio:" Canvas.Left="30" Canvas.Top="800" FontSize="26" FontWeight="Medium" /&gt;
          &lt;TextBlock Text="VA Debt Ratio:" Canvas.Left="30" Canvas.Top="900" FontSize="26" FontWeight="Medium" /&gt;
          &lt;clrtb:ClearableTextBox Canvas.Left="250" Canvas.Top="700" Height="75" Name="rt1" Width="208" /&gt;
          &lt;clrtb:ClearableTextBox Canvas.Left="320" Canvas.Top="700" Height="75" Name="rt2" Width="208" /&gt;
          &lt;clrtb:ClearableTextBox Canvas.Left="250" Canvas.Top="800" Height="75" Name="rt3" Width="208" /&gt;
          &lt;clrtb:ClearableTextBox Canvas.Left="320" Canvas.Top="800" Height="75" Name="rt4" Width="208" /&gt;
          &lt;clrtb:ClearableTextBox Canvas.Left="250" Canvas.Top="900" Height="75" Name="rt5" Width="208" /&gt;
      &lt;/Canvas&gt;
  &lt;/ScrollViewer&gt;
  </code></pre>