title: Databinding - setting default value
body: <p>I have code like this, in pagefunction making up a wizard:</p>
  
  <pre><code>&lt;TextBox Name="txtDate" Text="{Binding Path=Date}"&gt;&lt;/TextBox&gt;
  </code></pre>
  
  <p>The user types in and clicks next, object sent to next page with this data.</p>
  
  <p>But if I set</p>
  
  <pre><code>&lt;TextBox Name="txtDate" Text="{Binding Path=Date, TargetNullValue='2010-01-15'}"&gt;&lt;/TextBox&gt;
  </code></pre>
  
  <p>So I can have some "example" text in the box already, and the user hits next to accept this without changing it, no value is passed in the object to the next pagefunction. If the user changes it then it works as usual.</p>
  
  <p>So how can I have some default text without stopping the data being sent on?</p>