Choose the next instrument now and represent the button for the menu. Its color must be 595959.



Select this tool to draw a vertical stripe to the right side of the button. Its color is 545454.



Merge down the layers containing the button and the stripe next to it in a group.
Copy the new made group 3 times and place everything as you may see below.



Insert their names on the buttons by using





The final result is this one!

View full size here.