<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:local="clr-namespace:ThemedProgressPie" 
  x:Class="WindowsApplication1.Window1">
  <Grid>

    <local:ProgressPie Value="75" Margin="30"/>

  </Grid>
</Window>