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1. Create a slider
2. Delete the Handle Slide area (you dont need that part for progress / heath bars)
3. Set the Target Graphic to the Fill GO (child of Fill Area) - else it complains about not having a graphic
4. (now for the important part)
5. Set the Slider value to 0 - V.Important before altering anything else
6. Select the Fill GO and set its width to 0
7. Select the Fill Area GO and using the Rect Tool (in the editor toolbar) to alter It's Rect to fill the Background graphic (as shown below)