Is the Silverlight 4 builder compatible with Silverlight 5. Is the SL4 assembly "running at run time SL5"? If it is compatible, is it 100% compatible. Should you be able to use a third-party SL4 build in your SL5 project?
Or is it more like the .NET framework 2 and the .NET framework 4, which works side by side?
If I remember correctly, SL2 and SL3 were not compatible.
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