How to change colors?
To change the color of these buttons simply double click the body layer of the button inside the folder Bar. You will notice a layer that has an fx applied to it. Just double click the layer to enter the Blending Options Panel and once you are there chose the Color Overlay setting and apply your color then set the Blend Mode to Multiply.
Or the color can be changed simply by changing the color Gradient and setting the Opacity to 100%.