title: XAML - get user control position relative to whole window as binding property
body: <p>I'm new to XAML, so please be aware my question may contain some topic misundrestanding.</p>
  
  <p>Is it posible to bind XAML usercontrol global (relative to window) position to check if it's currently visible on screen? Usercontrol is inserted inside ScrollViewer and I think on something like:</p>
  
  <pre><code>  &lt;UserControl x:Class="Test.MessageControl"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Width="300"&gt;
        &lt;StackPanel &gt;
            &lt;Label Name="LabelTest" 
            Content="{Binding RelativeSource={RelativeSource Self}, 
            Path=MAGIC-GOES-HERE-Location.Y }" /&gt;
        &lt;/StackPanel&gt;
     &lt;/UserControl&gt;
  </code></pre>