New Post: Error using toolbox with managed C++

I have a managed C++ WinForm application that I am trying to drop a plot into. When I do so, I get the following error dialog:

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Microsoft Visual Studio
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Value does not fall within the expected range.
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OK   
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Helpful, right?

I am using the latest .NET 4.5 binaries. I added the plot control to the toolbox manually by browsing for OxyPlot.WindowsForms.DLL.

Any ideas? Is there any other information from me that would be helpful?