FIX. CommandBarMaskedEditBox - the mask cannot be set at design time.
Workaround:
Set it in code:
commandBarMaskedEditBox1.CommandBarMaskedTextBoxElement.MaskType = Telerik.WinControls.UI.MaskType.Numeric;
commandBarMaskedEditBox1.CommandBarMaskedTextBoxElement.Mask = "d";