This class is a UI widget, derived from CStatic that knows if the value it
is displaying is within tolerance or not. And when the value changes from
within tolerance to out of tolerance it can (If you set the colors) change
the background colors, say Green for intolerance, Red for out. You can set
the Font and the colors to what ever you want.
This controll is great when you are displaying a value and you want to notify the user
if the value is within tolerance or out of tolerance.
As always this controll can be either an LValue or an RValue