[Gambas-user] Ok, I'm stumped

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Gambas3

I have a GridView named gvOptions, and this code:

Public Sub gvOptions_Menu()

  Debug Mouse.X
  Debug Mouse.Y

End

1) Both Mouse.X and Mouse.Y tell me "no mouse event data"

    I need to capture the mouse position to pop up a window. How do I do 
that in g3?

2) Where is the main body of documentation for Gambas3?

    I will update it as I go on my journey of learning.