To reproduce: radMaskedEditBox1.MaskType = MaskType.Numeric; radMaskedEditBox1.Mask = "G"; Then enter 123.45 Workaround: Use "N" mask with fixed decimal places.
You cannot achieve this with a numeric mask. It would be better to use a standard or a regex mask.
You can't use the control with scientific format. You can't insert "E" character.