Can you tell me which version of the RadControls
you use in your project. Because with the latest official version, the minus sign is processed as soon as it's entered and the value is changed to negative even if its current value is 0 or null.
I attached a sample solution demonstrating the behavior of the RadMaskedCurrencyInput
with the Q1 SP1 2012 release. Can you please give it a try on your side and let me know if it works as expected on your side?
the Telerik team
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