Don,
>
>Are there many checkboxes trying to influence a single button? or is it 1 checkbox/button?
>Try it without the "this."
>Just a guess but I have found the 'this' reference to be unreliable.

In C# this refers to a member of an instance. So if a member regardless if it is a method or a variable or property or whatever is declared static it is not part of an instance and cannot be referenced with the "this" keyword.

I am not sure if I have found it unreliable other than that. If you try to refer to a non instance member using this. you will get a build error.

Tim