Workbench User Guide : Structuring an Application : How You Can Enforce Consistency Throughout Your Environment : Style Sheets
 
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Style Sheets
Associated with each frame and frame template is a style sheet. A style sheet defines the appearance of each type of field that can appear on any frame using that template. A style sheet lets you specify certain style attributes for each type of field that you can create for that frame or frame template.
For example, you can specify that buttons always be the same color or that entry fields always have the same outline width.
More information:
Creating Basic Frames