how can I make a GUI control (e.g. slider) respond to a change in the workspace variable?

Is there a way to make a GUI control, e.g. slider, or a label, or text box to respond to a change of the workspace variable without explicitly setting it properties every other place in the application that changes that variable?

I am constrained to do it in R2011, so the newer version's class event/listener feature is not available.

[Stephen23]

Short answer: no.

Long answer: write a class for that variable, and set a listener.

Trivial answer: write a little function that sets the slider. Call it everywhere where the variable is changed.

Alternative answer: write object oriented code, and have one method that sets the value and changes the slider.

[Michael]

Can you elaborate on the "Long answer"? a codelet would be helpful, or a pointer to the Reference. Thanks...