Altering the Lock Screen of a Theme
 

I apologize if this has been answered, but after about 10 minutes of searching I couldn't find the answer.

I've just started trying out themes for the Storm (9530). On the original Zen theme that the phone comes with whatever image I use for my background is the same image that is used when my phone goes into lock mode. However it seems with themes that even though I can change my default background screen, as soon as the phone locks it resorts to the original image the theme came with. Is there a way to change the lock screen background, or at very least tell the phone to use the default wallpaper as the wallpaper for the lock screen (like the original Zen theme does)