Accessing Control Attributes

[David Fecker]

I know this is a simple question, but I'm drawing a blank....

How do I access the attributes of a Control Button?
Specifically how do I check to see if the Control is visible or usable?

There is CtlEnabled() or CtlGetValue() but that's all I can find for "gets".
Why put a CtlSetUsable() and have no CtlGetUsable()?

Thanks,
Dave