Make Control From Here Button A Status Indicator As Well

[LameLefty]

Better shown with an example. 

This button should illuminate (change color) or act as a toggle or SOMETHING so that when I look at the part detail, I can tell at a glance that the part is serving as the control point for the vessel. Right now, you can click on a pod, probe core, docking port, whatever and all the button does is flash green as you click. But after the click, there's no way to tell which part in the UI widget is the control point. Changing the button color or making the button into a toggle switch instead would indicate clearly and instantly that the part is the control point for the current vessel.