@Vivek Ayyakannu I believe this will need some hands-on exploration. It sounds like you've tried the most basic suggestions I could offer without seeing the application. One item you might try (if it is workable) is to use the SendKeys method of the control to select it as this will force it as if a user had clicked it. Ideally though, we'd find what events need to be raised in order to make sending keys unnecessary.

I would suggest that you open a support case as someone should be able to take a look and determine how this might be accomplished. If you do open a support case, please list the case number in the post so that we can note any resolution for the issue.