Hello Javier! Welcome to the forum.
You’re right, ten days is a long time to receive a response. Your post somehow went unnoticed, our apologies.
As mentioned in this post from July Keyboard Shortcut to show/hide Charts window? - #2 by skysail, there is no official way to do this, not even for the built-in panels as far as I am aware. We have included a keyboard shortcut ( Ctrl + N ) since v0.6 using unofficial workarounds, but to my knowledge there is no way to bind the event to a joystick button.
Sorry for the inconvenience! If you believe that there is a way that we have not been made aware of yet, please let me know and I’ll look into it.
Kind Regards,
Malte