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.