How to add driver to Action? I'm learning to use Blenrig 5 Add-on and i've found some feature that i really like it but I don't know how to make one.
That's about how to add driver to Action.
As you see, by scale hand_close_L bone, the zrig_hand_close is animated, but i can't find where to config the driver of how to create one.

This is the zrig_hand_close action.

Thank you for taking your time.
Because of wrong keyword so i couldn't find the answer on google before.
But i just found out that it's all about Action Constraint.
More information and simple tutorial here