How should I do for my Tab Bar icon???(For iPhone 4)

I have already had the design. However, there are two resolutions:
30 x 30 pixels
About 60 x 60 pixels (high resolution)
Are they the same way to implement?
What is the implementation there???
I tried to put the icon file(png file) in my resources section of my Xcode, and then add the file from the attributes window of the tab bar. But It turned out that the image couldn't be shown, it was a square of gray color, no lines, no figures!
How come? What should I do?
Thanks a lot!!!

From the linked document:
For tab bar icons, create an icon in the following sizes:
For iPhone and iPod touch:
About 30 x 30 pixels
About 60 x 60 pixels (high resolution)
For iPad:About 30 x 30 pixels
Note: The icon you provide for toolbars, navigation bars, and tab bars is used as a mask to create the icon you see in your application. It is not necessary to create a full-color icon.
Use Preview, GraphicConverter, etc....see the Mac App Store for image editors and add an alpha channel to your image...size it, and add it to the bundle.

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