[Virtools] Clear Message

Hi,

I have a few simple questions, please help. I am new to Virtools.

1. How do I clear all the text displayed on the screen by using the "Text Display" Behavior under "Visuals"?

2. Which behavior should I use for the collision between characters?

3. Is there any "UNDO" for Virtools.

4. When I right click the mouse, I can see a menu. There is a "Copy selection", but I don't see any paste function. How do I copy and paste??

Regards,

George