title: How can i customize usercontrol from parent window
body: <p>I want to know how can i change user control from my Parent window that i placed usercontrol into it.</p>
  
  <p>I have an user control that have a grid and data grid in that. now i want change data grid properties in my window ... and i want add another control to my grid .
  some thing like this</p>
  
  <pre><code>&lt;window&gt;
  &lt;usercontrol&gt;
  &lt;usercontrol.datagrid backcolor=#ff00000&gt;
  &lt;usercontrol/&gt;
  &lt;window/&gt;
  </code></pre>
  
  <p>or can i add a textblock into usercontrol grid like this code :</p>
  
  <pre><code>&lt;window&gt;
  &lt;usercontrol.grid&gt;
  &lt;textblock grid.row=1/&gt;
  &lt;usercontrol.grid/&gt;
  &lt;window/&gt;
  </code></pre>
  
  <p>All element in user control are <strong>public</strong> so i can make change from c# code but i want do that with <strong>xaml</strong> design mode</p>
  
  <p>in windows form i create a user control inherit from data grid view then i custom it. i use it in 10 windows and in 11th window i need change data grid view a bit i dont change usercontrol because it change all windows so i just change that usercontrol is in 11th window
  please help !</p>