Select a gradient Fill

Its possible to ‘pick up’ a colour from the stage using the Eyedropper Tool… However is it possible to ‘pick up’ a gradient that you created so you can modify it slightly without having to totally remake it?

e.g. A Radial gradient with four colours setup for a shape… do some more work and use the colour mixer for another purpose… then want to modify previous gradient but its no longer on the mixer…

I hope I’ve explained myself well enough here, thanks in advance!