You may get .psd* file of Bamboo Fun tablet Photoshop tutorial by making a donation. Put the tutorial title in "Add special instructions to seller" line of PayPal and it will be sent to you shortly.
The largest button consists of three layers
The bottom layer - gradient layer.
The middle layer - border.
The top layer - inside part.
Apply Gradient Overlay to the bottom layer.
Apply the following adjustments to the middle layer.