Thanks for the question. Just to confirm, is the popup in question a full sized browser or a RadWindow? And if it's a browser window, is it modal or does it have the complete browser toolbar?
Also, based on the code you posted, the grid in question is html, right? And it seems as though the test is running to a certain point, so is the test failing with any particular error message?
But from your description, the scenario may just need a couple things. For the actual row selection, please try having the click test step simulate a real click with the SimulateRealClick property set to true.
The code would look similar:
For the submit button click step, please have the ClosesBrowser property set to True. If that does not work, please try switching the SimulateRealClick property set to true also for the step.
All the best,
the Telerik team
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