Prevent variable use without a declaration

Hi all,

Is there a way to prevent the use of a variable without first declaring it? There is a feature like this in visual basic.

If the ide doesn't support this check, is there a plugin that could apply this verification on "check for errors" pushbutton click?

This would really be helpfull to spot variable scope errors (global vs local to a function).

Thanks.

p.s. I use the visualblitz ide.