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Unhandled exception on second navigation

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Hi,

I have setup a page with the time wheel control. I can navigate to this page without a problem. However, if I navigation to the page with the control for a second time, the app crashed with an unhandled exception of type "Value does not fall within the expected range." The line of code that triggers with exception is the following:

double angle = calcFingerAngle(e.GetPrimaryTouchPoint(this.hour_slider).Position, wheels.hours);

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