How to change button in flex?

I was trying to create a simple application in flex builder where I need to change the layout of default button. I mean default button isn’t fitting with my application color combination.
I’ve created a image which suits well for that button, but how do I change it to take place of button ?

Can anyone help me out…

You can use image itself instead of button, and in click event, call the same method as that of button.