title: The TypeConverter for "Thickness" does not support converting from a string
body: <p>I am using following code for silverlight xaml file.</p>
  
  <pre><code>&lt;UserControl x:Class="DBServer.Selenium.Silvernium.ReferenceApplication.SilverlightFixture"    
               xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
               xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
               xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
               xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
               xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation" 
               mc:Ignorable="d" 
               d:DesignWidth="640" 
               d:DesignHeight="480"&gt;
      &lt;navigation:Frame x:Name="frameContent" Source="/MainPage.xaml" Margin="0,0,0,0"/&gt; // "Margin" on this line throws error
  &lt;/UserControl&gt;
  </code></pre>
  
  <p>But when i try to build it throws following error</p>
  
  <pre><code>The TypeConverter for "Thickness" does not support converting from a string
  </code></pre>