This tutorial shows the step into creating a profesional transparent Vista style menu.
Make a new document with the size you want.
I made it 400×150.
Now choose a background color, I choosed a blue color. Grab the Rounded Rectangular tool and make a shape like below on a new layer:
Select the layer with the shape and click the Layer Style button and click Blending Options:
Add the following modifications:
This is how It should look like:
Grab a brush size 1 Px white and on a new layer create a straight line(to create a straight line mouse click press and hold shift and go to the point you want the line to end.) and lower the layer opacity to around 30%.
In this step I am going to show you how to create a shine. So set your color to white. Make a new layer. Grab the Rounded rectangular tool and make a shape like below.
The shape should be white. If not you fill it white using the bucket and lower the layer opacity to 20% or so. Note I also used the eraser to delete the edges of the straight 1px line to make it look better.