Change default gradient colors option of a bar chart

[Anonymous]

Hi all,

I have a bar chart (or a treemap) and the colors are set By Measure, gradient.

Is it possible to change from the default Brown-yellow shades to green shades?

Or what function I can use to create gradient shades of a color if I use the option By Expresion? I  tred several functions but ca't get the gradient.

Thanks,

Liliana