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New Post: SingleUpDown Validation

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Is there any way to override the validation on the SingleUpDown control? I would like a null entry to be valid and not highlight the box as red.
When the control first starts with a null value it is fine, with the watermark being displayed instead. If the user then clicks on the control and does not enter a number (or if they enter a number and subsequently delete it), validation fails and the box is highlighted.

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