Step 2
Now we'll add the highlight to the top of the tab and make this example our first style tab.
Layers > New Raster Layer... > Ok
Because we haven't modified the selection with any blurring or anything, we won't need to reload it.
Selections > Modify > Contract... > Numbers of pixels: 2 > Ok

On the Tool Options palette set Selection type: Rectangle
While holding down on the Ctrl key on your keyboard, remove about 2/3 of the selection like this:

Now to make it real pretty like..
Selections > Modify > Feather... Numbers of pixels: 2 > Ok
TIP: The idea here is to keep increasing the feather until the width of the selection is the same as the image itself:

For the purpose of creating the other style tabs, lets go ahead and save this.
Selections > Load/Save Selection > Save Selection To Alpha Channel... > Save
On the Materials palette, click on the Foreground color and select the Gradient tab. Click on the image to open the available gradients. Select Fading white and use the following settings:

On the Tools toolbar, select the Flood Fill Tool (F) and fill the selection.
Selections > Select None
Layers > Merge > Merge Down
You should end up with a nice crisp image similar to this:

If you are happy with this easy tab, you can easily duplicate the layer ( Layers > Duplicate > )for each tab that you want and use the Move Tool (M) to line them up along side of each other. Here is a small example:

All I've done here is create an image the width that I needed for the tabs. For this example I used 500 x 100, created a selection about half the height of the canvas and selected Multi-red from the list of gradients on the Materials palette, adjusted the color to a blue using Adjust > Hue and Saturation > Colorize... then I created a tab using the steps above, duplicated it four times ( Layers > Duplicate ) and colonized them to a lighter blue. Simple enough right? OOPs.. almost forgot to mention, I often play around with the drop shadow just to add to the overall appearance. For the example above:
Effects > 3D Effects > Drop Shadow... I used the following settings:

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