How to create a simple single color visualization in simulink ?

Hi,I'm trying to visualize a single color in a simulink simulation. I would like to send a vector of 3 values [R,G,B] and simply have an that color displayed and updated live on some sort of screen/plot.

I have tried inserting an "matlab function" block and using this function:

function drawColor(RGB)
rectangle('FaceColor',RGB)

This works and displayes the color just like I want it to, but the display is updated very slowly.

Is there a proper way to do this ?