Creating an AddIn that is a UI with MAF

Question

In this article it is specified how to create an addin that is a UI using MAF:
https://msdn.microsoft.com/en-us/library/bb909887%28v=vs.110%29.aspx
However, I'm unsure how to implement the addin. I assume that addin is a
UserControl (WPF)
so the code behind of that view looks:
public partial class AddInUI : UserControl
public AddInUI()
InitializeComponent();
In the article it is said that addin must derive from AddIn View, which itself derives from UserControl:
[AddInBase]
public class AddInTestView : UserControl
However when I try to change that in the addin I get an error:
public partial class AddInUI : AddInTestView
public AddInUI()
InitializeComponent();
Error 2 Partial declarations of 'AddIn.AddInUI' must not specify different base classes
The article itself is not clear. So how do I implement the addin, if this is not allowed?

Answer 1

If you inherit your AddInUI UserControl from the AddInTestView class in the code-behind (AddInUI.xaml.cs) you must also specify the same base class in the XAML markup (AddInUI.xaml):
<local:AddInTestView x:Class="WpfApplication24.AddInUI"
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:WpfApplication1"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300">
<Grid>
</Grid>
</local:AddInTestView>
Note that "WpfApplication1" in the sample markup above refers to the namespace of the AddInTestView class:
namespace WpfApplication1
public class AddInTestView : UserControl
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