I need to create an application in which we are changing the style of the application that is theme of the application based on the button click.
I have download the theme that all contains different CSS file. I need to dynamically declare the CSS for the application to apply that theme.

I have file name Theme1.css, Theme2.css, Theme3.css, Theme4.css, Theme5.css.
when I click on the Theme 1 Button then I need to apply Theme1.css file as source of style. similar like that when I click on the Theme 2 Button then I need to apply Theme2.css file as source of style.
Note : css file contains Style for both application and component of the Application.
Have a Nice DAY….
You would have to use the facility within eclipse/flex builder to compile the CSS into SWF so that the styles can be changed at runtime.
You would also have to maintain the instance variable of the current theme id.
Is this what you are looking for?
You would then assign the click handlers for each button to the switchTheme function – passing the theme id as a parameter.