I got a few queries after releasing XamlPadX v3 regarding creating addins for the tool. So here is a small post on it. :) Create a customControlLibrary project. Add a reference to the AddInView dll present in the XamlPadX folder which is located in the program files folder. Also add a reference to the 3.5 System.Addin dll. Now in the xaml file change the UserControl Tag into AddInAddInView < f:AddInAddInView x:Class = " customaddin.UserControl1 " xmlns = " http://schemas.microsoft.com/winfx/2006/xaml/presentation " xmlns:x = " http://schemas.microsoft.com/winfx/2006/xaml " xmlns:f = " http://foo " Height = " 200 " Width = " 200 " > < Grid > < Rectangle Fill = " red " Height = " 100 " Width = " 100 " /> </ Grid > </ f:AddInAddInView > the namespace is exposed as http://foo/ in the AddInView.dll :) Now for the code behind [ AddIn ( "MyAddin" , Description= "This is my addin" , Publisher= "MS" , Version= "1.0.0.0" )] public partial class UserControl1 : AddInViews.
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