zindex change

- now places the home button on top of the tab panel header to retain responsiveness when shrunk

src/DynamoCoreWpf/Views/Core/DynamoView.xaml

@@ -807,6 +807,7 @@
                                                                     Width="42"
                                                                     Height="42"
                                                                     Margin="{Binding MinLeftMarginOffset, Converter={StaticResource LeftMarginConverter}}"
+                                                                    Panel.ZIndex="1"
                                                                     BorderThickness="0"
                                                                     Click="HomeButton_Click"
                                                                     Cursor="Hand">