title: How to assign Watermark property to a TextBox's Text in code behind (MahApps)
body: <pre><code>&lt;TextBox
          Name="mytextBox"
          Controls:TextBoxHelper.Watermark="User"
          Controls:TextBoxHelper.ClearTextButton="True" /&gt;
  </code></pre>
  
  <p>I have <code>ComboBox</code> and each index i want to change this <code>Watermark</code> accordingly.
  Is it possible to change this <code>Property</code> via code behind ? </p>