Hello Mike Baldini,
Thank you for the question.
In order to change the colors of RadProgressBar, you actually need the ProgressBarPrimitive instance:
ProgressBarPrimitive prim = (ProgressBarPrimitive)
However, it may be a bit difficult to control GradientPercentage and GradientPercentage2 properties dynamically. Therefore, you can insert a FillPrimitive with predefined colors and make the colors of the ProgressBarPrimitive transparent. In addition, when the progress is running, you should move the gray FillPrimitive of RadProgressBar to right. This will allow you to achieve the desired look. I am attaching a sample project which demonstrates the approach.
I hope this helps. If you have additional questions, feel free to contact me.
the Telerik team
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