Now we will create the two end bits for the tab. To do that, our first task will be to create a selection of the desired shape. With the Ctrl key pressed down click on the layer thumbnail of the 'base'; layer on the layer palette. Now we have the boundaries of the 'base' layer selected. Now create a new layer called 'left_end'. Select the Elliptical Marquee tool and with the settings shown below trace out an ellipse as shown.
The result of these actions is that we get an intersection of the boundaries of both the 'base'layer and the ellipse that we drew out. You should end up with the following selection.
Now select the Paint Bucket tool and fill the selection with a dark shade of gray. Okay so the left end bit is ready. Now you can repeat the same process for getting the right end bit. But here is a short cut: Just press Ctrl+J and you get a copy of the layer 'left_end'. Rename it to 'right_end'. You also need to invert it laterally to fit it in on the right end of the tab. For doing this, with the 'right_end' layer selected on the layer palette choose from the menu: Edit > Transform > Flip Horizontal.
Position it on the right end of the tab so that you get the following result:
Now we will create the dark coloured bar at the back of the 'base'. For this, create a new layer called 'back_tab' and move this layer below the 'base' layer in the layer palette. Now grab the Rounded Rectangle tool (choose any colour for now) and draw a shape below the base so that you get something like this:
Now apply the following styles to the 'back_tab' layer.