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I've got a strange problem adding a dll reference. I've got a WPF application and am trying to use the WPF MDI library: http://wpfmdi.codeplex.com/ As stated in the instructions (which are very vague), I right-clicked on references in VS2012, clicked on Add reference.. , clicked on Browse.. and added my dll which I downloaded. Next, I added the following line in the XAML of my window: xmlns:mdi="clr-namespace:WPF.MDI;assembly=WPF.MDI" as stated in the instructions. However, when trying to add an <mdi:MdiContainer> in the XAML, the following error messages are displayed: The type 'mdi:MdiContainer' was not found. Verify that you are not missing an assembly reference and that all referenced assemblies have been built. The name "MdiContainer" does not exist in the namespace "clr-namespace:WPF.MDI;assembly=WPF.MDI". This is my XAML: <Window x:Class="QueryBuilder.Table" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mdi="clr-namespace:WPF.MDI;assembly=WPF.MDI" Height="300" Width="300" WindowStyle="ToolWindow" ResizeMode="NoResize" ShowInTaskbar="False"> </Window> This problem has been frustrating me all day. I've tried almost everything imaginable. One thing worth noticing is that I've downlaoded the sample application from the library's site, and I can run it with no problems. Besides this, I have added this to the xaml.cs class of my project: WPF.MDI.MdiContainer d = new WPF.MDI.MdiContainer(); and it compiles with no problems at all. Please also note that my initial problem was asked here

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