I am not sure I understand what you say, but here are some additional remarks.
>> Interesting that the sprite file created (using the Visual Style Tool) does not contain the gradient png I uploaded to use.
The Visual Style Builder does not modify sprite images by adding or removing parts from them.
>> The css for all the other elements points directly to the filename and not a location in the sprite.
In some cases the background image styles pointing to the image, and the background position styles specifying the location of the image part in the sprite, are in separate CSS rules. This is done for optimization purposes.
>> Are you saying the only way to change the caption/title bar for a pop-up form is through the sprite file?
No. I meant to say that you should specify explicit background position to the popup edit form header, not just a background image style:
.RadGrid_purple_grid .rgEditForm .rgHeader
background-image: url('Grid/gradient_35.png') ;
background-position: 0 0 ;
All the best,
the Telerik team
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