I just answered your support ticket with the same question. I will give the information here as well, so that it is available to all:
The behavior you describe is by design. However, I do understand your point of view and because of cases like yours, we have on our TODO list for the RadSlider control, the task to implement an IsDirectionReversed property. When set to "true", this property will cause the RadSlider to switch the values of its MinimumValue and MaximumValue properties. Unfortunately, this functionality will not be ready for the Futures release, scheduled for this week. We will do our best to implement it for the official Q3 release though. In case it is ready earlier, I can notify you and send you an internal build with the changes.
Apart from this, you can easily mimic this behavior, using the client API of the control. You can use the following settings:
- MimimumValue = (-100)
- MaximumValue = 0
When you access the value of the RadSlider, simply multiply the value by (-1).
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