    <UserControl
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="WPFAddIn1.AddInUI">
    
    <StackPanel>
		<Button Click="clickMeButton_Click" Content="Click Me!" />
    </StackPanel>
    
</UserControl>
