1. Make a rectangle with the Rectangle Tool (any color) and Rasterize it.
2. Then ad a Gradient Overlay: #252525, #595959 and #9a9a9a
3. And a Stroke: #424242
4. Make a gradient just over the middle of the button and go to Select/Modify/Contract and put 1px, then create a New Layer and fill it with any color, press Ctrl + D and change the fill to 0%
5. Add a Stroke: Transparent to White
6. Your button should look like this:
7. Create a New Layer and make a selection 1px height and fill it with a Radial Gradient, White to Transparent, starting out from the middle and deselect.
8. Now you're going to do the same you did in the Step 7 but using #4a4a4a for the gradient.
9. And you should have something like this:
10. Create a New Layer and make a selection as shown below and fill it with a Linear Gradient #dadada to Transparent
11. Finally add some text, using Segoe 13 pt.
Also you can make a Navigation Bar like this, using the same steps.
More Tutorials: 
