title: Transparent busy indicator
body: <p>I'm using busy indicator from wpftoolkit library. This is my code:</p>
  
  <pre><code>&lt;Window x:Class="BusyControl.MainWindow"           
          xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit"
          xmlns:gif="http://wpfanimatedgif.codeplex.com"
          mc:Ignorable="d"
          Title="MainWindow" Height="350" Width="525"&gt;
      &lt;Grid&gt;
          &lt;xctk:BusyIndicator Name="ProgressIndicator" IsBusy="False" Background="Transparent" BorderBrush="Transparent" BorderThickness="0"&gt;
              &lt;xctk:BusyIndicator.BusyContentTemplate&gt;
                  &lt;DataTemplate&gt;
                      &lt;StackPanel&gt;
                          &lt;Image gif:ImageBehavior.AnimatedSource="Resources/loading.gif" Width="150" Height="50" /&gt;
                          &lt;TextBlock Text="{Binding ElementName=ProgressIndicator, Path=BusyContent}" HorizontalAlignment="Center" Margin="3"&gt;&lt;/TextBlock&gt;
                      &lt;/StackPanel&gt;
                  &lt;/DataTemplate&gt;
              &lt;/xctk:BusyIndicator.BusyContentTemplate&gt;
              &lt;xctk:BusyIndicator.ProgressBarStyle&gt;
                  &lt;Style TargetType="ProgressBar"&gt;
                      &lt;Setter Property="Visibility" Value="Collapsed"/&gt;
                  &lt;/Style&gt;
              &lt;/xctk:BusyIndicator.ProgressBarStyle&gt;
              &lt;Grid&gt;
                  &lt;Button Content="Click me" Click="ButtonBase_OnClick" Width="100" Height="50"&gt;&lt;/Button&gt;
              &lt;/Grid&gt;
          &lt;/xctk:BusyIndicator&gt;
      &lt;/Grid&gt;
  &lt;/Window&gt;
  </code></pre>
  
  <p>But my busy indicator looks like</p>
  
  <p><a href="https://i.stack.imgur.com/7rp5t.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/7rp5t.png" alt="before"></a></p>
  
  <p>but I need transparent busy indicator like this</p>
  
  <p><a href="https://i.stack.imgur.com/PKnpz.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/PKnpz.png" alt="After"></a></p>
  
  <p>How can I do that?</p>