Yes this is possible. It is not possible with FormatString but there is an elegant code-behind solution:
CultureInfo culture =
culture.NumberFormat.CurrencyNegativePattern = 11;
culture.NumberFormat.CurrencyPositivePattern = 2;
mask.Culture = culture;
You can also examine the CurrencyNegativePatterns
Let us know if you need further assistance.
All the best,
the Telerik team
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