Thanks everyone for your response.
I do have a "Load Dashboard Server Task" attached to the button which makes sense why it will not work as many pointed out in your comments. I tried in a completely different environment and it works as expected.
But still am curious, i tried to create a new button which doesn't have Load DashB Server Task (environment in which the issue exist) and still it doesnt work. I would have expected it to work if Load Task was the sole reason behind this.
From what I know, the XFLoadDashboardTaskResult object that gets returned on the Load Dashboard Server Task is the only object related to dashboards that allow you to change parameter values upon loading a dashboard. I believe the WcfEventHandler BR (if you are using this) is not generating a Load Dashboard Operation either.
One last thing I can think of, is that you have a parameter set on the Form template level:
Although the screen indicates you can set Literal Parameter Values, I have also successfully used it with other parameter types. Is this field empty on your Form Template that your dashboard is assigned to?
Regards,
Paul
