wifi-sitter/WifiSitterGui/App.xaml

<Application x:Class="WifiSitterGui.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:WifiSitterGui"
             StartupUri="TrayIconControl.xaml">
    <Application.Resources>
        <Viewbox x:Key="CloseIcon" x:Shared="false" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
            <Grid>
                <Grid Name="backgroundGrid" Width="24" Height="24" Visibility="Visible">
                    <Rectangle Fill="#FF000000" Name="Rect" Visibility="Visible" />
                </Grid>
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                    <Path.RenderTransform>
                        <TransformGroup>
                            <TransformGroup.Children>
                                <RotateTransform Angle="0" />
                                <ScaleTransform ScaleX=".5" ScaleY=".5" />
                            </TransformGroup.Children>
                        </TransformGroup>
                    </Path.RenderTransform>
                </Path>
            </Grid>
        </Viewbox>

    </Application.Resources>
</Application>