Make a copy of the stripe and place the copy under the neighboring buttons row:



The Ellipse Tool (U) will be helpful in making roundness between the buttons’ rows with the same gradient’s parameters the stripes have:



Using the Rounded Rectangle Tool (U) with 30 px, try to make one more button:



Blending Options>Gradient Overlay:

 

 



Represent one more button inside:



Blending Options>Gradient Overlay:

 

 



Blending Options>Drop Shadow:

 



Blending Options>Stroke: