I have declared an ultranumeric editor and assigned it to a ultragrid in the editorComponent

The declaration is as follows

UltraNumericEditor ultraNumEditor = new UltraNumericEditor();
ultraNumEditor.SpinButtonDisplayStyle = Infragistics.Win.ButtonDisplayStyle.Always;
ultraNumEditor.FormatString = "#0";
ultraNumEditor.NumericType = NumericType.Double;
ultraNumEditor.MaskInput = "nnnnnnnnnnn";
ultraNumEditor.Nullable = false;
grdTrades.DisplayLayout.Bands[0].Columns[COLUMN_COMMITTEDQUANTITY].EditorComponent = ultraNumEditor;
grdTrades.DisplayLayout.Bands[0].Columns[COLUMN_COMMITTEDQUANTITY].CellActivation = Activation.AllowEdit;

The above editor is allowing the user to clear the data and keep it blank, in which case it returns DBNull as the value. I want the NumericEditor control to automatically set the blank value to zero. Also in the above I want the user to enter only non negative numbers without any decimals.