• Message: "section is empty"
  
• Type: System.Exception
  
• Source: "Infragistics2.Win.v8.1"
• StackTrace:    at Infragistics.Win.UltraWinMaskedEdit.NumberSection.ToDecimal()

 I have a UltraNumericEditor:                           

ultraNumericEditor1.NumericType = NumericType.Double;            

ultraNumericEditor1.DataFilter = new PercentageDataFilter();   

ultraNumericEditor1.MaskInput = "nnn\\%";               

ultraNumericEditor1.SpinButtonDisplayStyle = Infragistics.Win.ButtonDisplayStyle.Always;               

ultraNumericEditor1.MaxValue = 100;               

ultraNumericEditor1.FormatString = "##0\\%";

When I delete all numbers from the control, that exception is raised from i-don't-know-where, but is not my code, and I don't know how avoid it.

 How could I avoid the user introduce values with the keyboard? I only want that the user can modify de value with the spin buttons.

Cheers