All of the items on the front panel report their position relative to the 0,0 point of the panel.
You can find the 0,0 point of the panel by turning on the front panel grid and looking for the point where the two heavier lines cross with a dot. See the attached image, this shows the 0,0 point. If you move the controls upper left corner to this point, you'll see the control now shows a 0,0 position.
If you want the controls position relative to entire screen, use the Front Panel Window:Window Bounds property to get the window position and a bit of math to calculate where the control is relative to that.
Ed

Ed Dickens - Certified LabVIEW Architect
Lockheed Martin Space
Using the Abort button to stop your VI is like using a tree to stop your car. It works, but there may be consequences.