Showing two different images for disabled checkbox in Smart GWT 3.0

Hi
I need to show different images for disabled checkbox in Form and in grid.

Current Smart GWT 3.0 uses the image unchecked_Disabled.png from images/DynamicForm folder for both the form element and for the grid.

I need to show Blank in the grid instead of the unchecked_Disabled.png, but not for the form element.

Is there a way i can achevie this. Please help.

FYI, I have created my own theme overriding the load_skin.js and skin_styles.css for changing the styles.

Thanks
Ramesh Reddy Etta.