Mouse events for Signature process

Can someone brief me the process ‘How to use Mouse events for a signature process”

I’m currently using Pocket VNC to remote windows mobile devices from EggPlant.
Unfortunately, I can’t user mouse clicks, drag events for a signature.

tried to use - MouseButtonUP, MouseButtonDown etc but no luck

One of our application need a signature and you can’t even type on this form as this only allows users to sign with a stylus. How can I achieve this by using Pocket VNC?

I’ve attached a screenshot, in case If I confuse you guys.