I have a parameter form which, of course, displays when the report is clicked, but diaappears after the report is run. I'm trying to retain the parameter form, but clear it's texboxes, after the report is run, as opposed to having to click the report again to re-display the parameter form. Is there an appropriate trigger that I should be using for this?
As far as I know, it is not possible to perform what you'd like to in Report Builder's parameter form.
You might create a "universal" form (this "form" would be product of the Forms Developer) which would then act like report's parameter form; you'd populate parameters and send them to the report (using, for example, a button and the WHEN-BUTTON-PRESSED trigger), execute it and - in the meantime, while the report runs - form would be still there waiting for another input.