I've looked at the glControl sample in the release zip, and it displays a rotating cube.
However, it does not split the rendering and the logic code. Instead it draw the render as fast as it can in the idle cycles, and in the same function updates a rotate variable.
On my computer this results in a jerkely rotating cube.
In the 15 minute intro into opentk, it is said that one can override an onUpdatFrame method and an onRenderFrame method.
This seems more logical as you can now split the update and the render logic (as it should).
However I don't see how this should work with the glControl sample. Can anyone give me a pointer?