title: Can't see WPF control on top Winform Control
body: <p>I want to show WPF control on top Winform Control.
  I want that the WPF Button will appear on top on the Winform TextBox.</p>
  
  <p>The result is that the WPF control is hidden in the back of the winform TextBox and I can't see it.
  Why is that? </p>
  
  <p>This is my code:</p>
  
  <pre><code>&lt;UserControl x:Class="Philips.PmsCT.Host.Applications.ExamApplication.ScanRulerComponent.WPFHostWF"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:wf="clr-namespace:System.Windows.Forms;assembly=System.Windows.Forms" Width="800" Height="120"&gt;
  &lt;Grid&gt;
      &lt;WindowsFormsHost &gt;
          &lt;wf:TextBox  BackColor="LightBlue" /&gt;
      &lt;/WindowsFormsHost&gt;
      &lt;Button Width="100" Height="25" Background="Red"/&gt;
  &lt;/Grid&gt;
  </code></pre>
  
  <p></p>