Creating form and add it into menu (SDI)?


I found the "Creating a form based on a string" from Inprise's TI 3197 is
very useful.
However, I want to create a form and add it into a main menu (SDI) and then
while selected the form
from the main menu, the form will show again without recreating it.

1. How to determine to create the form or show it while not created?
2. How to add it into a menu's window option (SDI format) like MDI's window
option in the main menu?

Thanks in advance!

Best regards,

Sammy Leung