oh dear, I think I am drowning here!

What is the Extender? Do I need it?

I dont want to change default values at design-test time, I want to type 200 into the MAX property in the properties pane...I want the control to know this is what I typed...no matter what happens to this MAX value during execution I want the same value (200) to still be there when I get back to the properties pane.

Its times like this that I really hate Microsoft for making things unnecessarily complicated!