Than I have another one for you : open GMs Help (the little blue button with a white question-mark in it at the right of the toolbar at the top), and type the word "mouse" in the input box under the "index" tab. You'll be amazed about what you can find there.
Please help me with this im out of ideas.
And yes, what you are looking for is visible in that list.
Too late ...
Thank you, I never knew you could look at it like that in the help!