<UserControl x:Class="ExpReflCtrl.mybutton"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Height="300" Width="300">
    <UserControl.Resources>
        <GeometryGroup x:Key="clipGeometry" FillRule="Nonzero">
            <EllipseGeometry RadiusX="50" RadiusY="50" Center="70,70"></EllipseGeometry>
        </GeometryGroup>
    </UserControl.Resources>
    <Grid  Name="mygrid">
        <Viewbox Name="myviewbox">
            <Viewbox.BitmapEffect >
                <DropShadowBitmapEffect Color="Blue" />
            </Viewbox.BitmapEffect>
            <Button Width="150" Height="150" Clip="{StaticResource clipGeometry}" HorizontalAlignment="Left" VerticalAlignment="Top" FontFamily="Times New Roman" FontSize="40">
                 13 </Button>
        </Viewbox>
    </Grid>
</UserControl>

        private System.Windows.Forms.Integration.ElementHost elementHost1;
        private UserControl1 userControl11;