Hi Basher,
configure your Express VI, than make a rightclick on it and chosse "Open Frontpanel" from contextmenu. After choose convert from message box you will see the frontpanel of your Express VI. Change to blockdiagram. There should be a VI called Timing.vi. This has a entry named rate which is connected to a constant. Make e rightclick on this constant and choose "change to control" from context menu. Now you have to go backto frontpanel. On the right sight there is the icon of your VI, make a richtclick on it and choose "Show Connector". Connect an empty field of it to your control and save all. In your Main.VI Express.VI has changed to a SubVI with an additional entry.
Hope this will help you.
Rebecca Fox
National Instruments Germany
Rebecca Fox
Applications Engineer
National Instruments