title: How to make Search hint textbox background same as textbox background
body: <p>I have search hint textbox</p>
  
  <pre><code>       &lt;TextBox 
                  TextChanged="textboxsearch_TextChanged"
                 Grid.Column="4"  Margin="0,0,10,10" Height="22" &gt;
                  &lt;TextBox.Style&gt;
                      &lt;Style TargetType="TextBox"&gt;
                          &lt;Style.Triggers&gt;
                              &lt;Trigger Property="Text" Value=""&gt;
                                  &lt;Setter Property="Background" Value="{StaticResource SearchHint}" /&gt;
                              &lt;/Trigger&gt;
                              &lt;Trigger Property="IsKeyboardFocused" Value="True"&gt;
                                  &lt;Setter Property="Background" Value="White" /&gt;
                              &lt;/Trigger&gt;
                          &lt;/Style.Triggers&gt;
                          &lt;Setter Property="VerticalAlignment" Value="Bottom"/&gt;
                      &lt;/Style&gt;
                  &lt;/TextBox.Style&gt;
              &lt;/TextBox&gt;
  </code></pre>
  
  <p>here is SearchHint style</p>
  
  <pre><code>   &lt;VisualBrush x:Key="SearchHint" Stretch="None"&gt;
          &lt;VisualBrush.Visual&gt;
              &lt;TextBox FontStyle="Italic" Background="White" Foreground="Gray" Text="Enter search text…"  /&gt;
          &lt;/VisualBrush.Visual&gt;
      &lt;/VisualBrush&gt;
  </code></pre>
  
  <p>The search box back ground is filled by the searchhint style. The problem I have now is how can I make the width of the visual brush fill the size of the textbox. Right now it fills only a portion of the textbox. 
  The Text="Enter search text…" has a white background but the rest of the textbox is gray. I wanted to have a white background with gray hint text.</p>