c#wpf.net-4.5helix-3d-toolkit
Can't seem to correctly add Helix Toolkit to my C# (Visual Studio Express 2012) project
I've been trying to add a HelixViewport3D to my WPF application and keep failing spectacularly - I have managed to add references to some precompiled .dll's for .NET-4.5 from here, but then I still cannot add the desired element to the GUI.
Here's a screenshot which hopefully says everything you need to know: 
After dragging the HelixToolkit.Wpf.dll file into the toolbox, and then trying to add it from there, this is what happens: 
to which no amount of "OK"-ing, restarting, or furiously mashing the keyboard will fix the problem
Solution
Unblock the zip file you downloaded before adding a reference to the dll. The VS designer fails due to the security restrictions added to files downloaded from the internet.
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