minor fix

@metheofanis tnx

src/Shared/HandyControlDemo_Shared/Resources/Themes/Styles/Style.xaml

@@ -15,10 +15,10 @@
         <Setter Property="Template">
             <Setter.Value>
                 <ControlTemplate TargetType="Button">
-                    <Grid>
+                    <hc:SimplePanel>
                         <Path Data="{StaticResource CirclePanelDemoGeometry}" Fill="{DynamicResource PrimaryBrush}" Height="77" Width="36.06"/>
                         <Path Data="{StaticResource CirclePanelRightGeometry}" Stretch="Uniform" Margin="12" Fill="White"/>
-                    </Grid>
+                    </hc:SimplePanel>
                     <ControlTemplate.Triggers>
                         <Trigger Property="IsMouseOver" Value="True">
                             <Setter Property="Opacity" Value=".9"/>