How Xbee Need to use X-CTU before communication with LabVIEW ?
The XBee doesn't communicate with LabVIEW. It puts data on the serial port and gets data from the serial port. Whether the other end of that serial port is connected to the Serial Monitor application or LabVIEW is irrelevant.
Why are you using Mesh Network modules to do Point to Point communications? How have you configured the XBees? Do you KNOW that they communicate?
Finally, answer the questions that are asked before asking more.