ZZ-EFEM/Jet/Jet_001_2P_Jet/EfemRT/Backends/MessageTestView.xaml

<UserControl x:Class="EFEM.RT.Backends.MessageTestView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:EFEM.RT.Backends"
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300" Background="AliceBlue">
    <Canvas>
        <Button Width="120" Height="35" Content="Send" Canvas.Left="52" Canvas.Top="47" Click="ButtonBase_OnClick"></Button>
            
    </Canvas>
</UserControl>