Thank you for your note. Based on the console output with "monitorEvents(window);" in Chrome developer mode, I tried ReiseEvent method with onclick, onchange (before and after setting the value), onmousedown, onmouseup. But still, the submit button cannot be pushed. As far as I looked into the HTML source code, just change event seems to be needed though. No other things to be considered?
I often use the TestMethods options when in interrogation mode to try various combinations of RaiseEvent. But it is hard to answer without seeing the application. I had an application on one project in which the visible controls set some hidden controls that were then submitted. We had to interrogate the hidden controls and set them to be able to control the app.