If I want to create a Listbox to run multple tests, how can I create a check all and clear all button for selection/deselection of all the tests

[parthabe]

Your problem lies in the way you ve coded.

Put your DAQ Assistant Express VI inside a case structure that functions based on a boolean input named as Generate Waveform. Dont generate the waveform always, thats why you cannot control its colour.

See the attached VI.

[Van_L]

Parthabe is absolutely right,

I demonstrated a poor way of programming.
The while loop will drain all the resources of the CPU if we don't put a wait in it.
By putting a wait, it will free up some resources so other programs running the background can operate as well.

Thx Parthabe