message: Fixed popup horizontalOffset (win)
diff: </UserControl.Resources>
  <Popup Name="popup" x:FieldModifier="private"
  - MaxHeight="500" StaysOpen="True" AllowsTransparency="True">
  + MaxHeight="500" StaysOpen="True" AllowsTransparency="True"
  + HorizontalOffset="-10">
  <Grid>
  <Grid.Effect>
  <DropShadowEffect BlurRadius="8" ShadowDepth="2" Opacity="0.3" Direction="270" />
  