msfs-popout-panel-manager/WpfApp/PanelCoorOverlay.xaml

<Window x:Class="MSFSPopoutPanelManager.WpfApp.PanelCoorOverlay"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        mc:Ignorable="d"
        Title="PanelCoorOverlay"
        ResizeMode="NoResize"
        WindowStyle="None"
        Height="30" 
        Width="30" 
        SizeToContent="WidthAndHeight"
        Background="#01F0F0FF"
        AllowsTransparency="True"
        MouseMove="Window_MouseMove"
        Loaded="Window_Loaded">
    <Grid>
        <Label Name="lblPanelIndex" Content="1" HorizontalAlignment="Center" VerticalAlignment="Center" Padding="0,0,0,2"/>
        <Image Height="30" Width="30" HorizontalAlignment="Left" VerticalAlignment="Top" Opacity="1" Source="resources/transparent.png"/>
    </Grid>
</Window>