Illustrator hexadecimal values for gradients

Hey guys Ive just started getting into illustrator and Im wondering how I can get the color picker window up so I can select my color for each color stop (slider). Currently I can only choose from swatches or if I double click on a color slider but that only brings up either the color swatches or the RGB spectrum which is fairly difficult to use compared to the larger color picker window that allows me to also use hexadecimal values. Any help would be greatly appreciated.