I using QuantityUpDown control and found out, that it don't show negative value.
I overrideValueChanged() event handler.
When value is zero and down arrow pressed, ValueChanged() invokes and QS.Value == -1.
But, after that, ValueChanged() invokes once more and QS.Value become 0.
I checked QS.Minimum value - it equals to Int32.MinValue;
I tried override event handlers, that may reset value to zero, but it not helps:
QS.TouchDown += (o, e) => {};
QS.PreviewMouseDown += (o, e) => {};
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