Modal windows essentially suspend processing until they are dismissed. In this regard, I can’t think of a means by which you could display a modal dialog (whether it be owned by Formativ or not) and still have applet processing occur.
We have done something similar in the past, but instead of displaying the form modally, we simply show the form and set it as the topmost window. This allows the applet to continue processing. At the appropriate time the applet closes the window. We had an external COM Automation DLL that exposed a couple of methods – something like ‘ShowStatus’ and ‘HideStatus’.
I hope this helps.