Select just the red section with the white pointer or ungroup / unmask it and get to it. With the color mixer window open, when you select it then drag the red box on the color mixer window down to your default color palette. Unless it's a flattened raster image, then just use a color picker to figure out it's values. As mentioned by terro, I bet it's RGB.... you do know that you will get a LOT wider range of color using RGB right? Make a block of red, set it to RGB red, then in the color mixer change it to CMYK and marvel at how dull and ugly it gets. Flexi does particularly well with RGB and particularly well with file that have an Adobe RBG profile, go figure since Flexi uses Adobes native PS RIP engine... We only use CMYK if we have to for some odd reason. Custom color palettes are also a handy tool.