Set Android Theme.Light for Alert Dialog

I am trying to set the android Theme.Light theme for my alert dialog, but with no success so far. After reading a few tutorials I gathered that using AlertDialog.Builder we cannot set the theme directly in the constructor (atleast in API level 7). The alternate solution that I found is using a ContextThemeWrapper, which everyone assured would solve my problem. So I coded something like this: ``` AlertDialog.Builder builder = new AlertDialog.Builder( new ContextThemeWrapper(context, R.style.popup_theme)); ``` I described my theme in the values folder: ``` <?xml version="1.0" encoding="utf-8"?> <resources> <color name="back_color">#ffffffff</color> <style name="popup_theme" parent="@android:style/Theme.Light"> <item name="android:windowBackground">@color/back_color</item> <item name="android:colorBackground">@color/back_color</item> </style> ``` Unfortunately I still get the default Theme.Dialog.Alert theme. Can anyone tell me why? Where am I going wrong? EDIT: If you do not know the answer to my question, please vote up. I have a bad habit of posting questions which get stuck :(