When I use colour changer dialog box, I would like to see result before Ok button pressing! When you colorize complex image it's really important to see the colour changes on fly rather than clicking Ok button hundred times.
Select your object with a pre-defined color.
From the "Menu" bar choose "Effects>Adjust>Hue/Saturation/Brightness" The Hue slider will give you a live preview.
But I agree an instant preview would be better.