Hi Teimur -
You can achieve this functionality through the wonders of VI Server - a program that allows you to control LabVIEW from LabVIEW itself or Visual Basic, VC++, CVI, etc.
If you go to www.ni.com/support and search under Option 3 for examples and "vi server" you will get several LabVIEW examples for controlling LabVIEW from LabVIEW via VI Server. Let us know if you need any more help.
ben schulte
national instruments