title: wpf binding text inside usercontrol text box from main window text box
body: <p>main window </p>
  
  <pre><code>&lt;TextBox x:Name="fbSearchBox" Margin="69,10,298,11" TextWrapping="Wrap" BorderBrush=" x:Null}"/&gt;
  &lt;local:FacebookAutoComplete "want to set text from here of fbSearchBox" /&gt;
  </code></pre>
  
  <p>user control</p>
  
  <pre><code>&lt;UserControl x:Class="ZuneWithCtrls.Pages.Facebook.Home.FacebookAutoComplete"
           xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
           xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
           xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
           xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
           mc:Ignorable="d" 
           d:DesignHeight="300" d:DesignWidth="300" Width="431" Height="49"
           x:Name="uc"&gt;
  &lt;TextBlock x:Name="txtDynamicText"/&gt;
  
  &lt;/UserControl&gt;
  </code></pre>
  
  <p>want to show text in txtdynamicText when type from fbSearchBox.. Plz help</p>