Right to left slider Windows Phone 7

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C#

Mobile

Windows-Phone-7

I have a bar and I needed to go from -30 to 30 and I was going to use 2 slide bars so that they start both from zero, one goes to the left, and the other starts from zero and goes to the right. I would like them to go separate ways and automatically fill themselves according to a value which is given, and these bars will show the reading.

If anyone would help me please on to how to set it on the opposite direction, or else suggest another way of doing it please.

Thank you in advance.