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UltraNumericEditor used in grid will not allow for null (no value)
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I have a UltraNumericEditor (defined as below) that I use as the EditorControl for a UltraDataGrid cell.  But when I try to leave the control empty I get the following error displayed:

DATA ERROR
Unable to convert from '(null)' to 'System.Int32'

Definition
this.uneCheckValues.Location = new System.Drawing.Point(767, 109);
this.uneCheckValues.MaskClipMode = Infragistics.Win.UltraWinMaskedEdit.MaskMode.IncludeBoth;
this.uneCheckValues.MinValue = 0;
this.uneCheckValues.Name = "uneCheckValues";
this.uneCheckValues.Nullable = true;
this.uneCheckValues.PromptChar = ' ';
this.uneCheckValues.TabIndex = 16;
this.uneCheckValues.Visible = false;

Entry in the cell is not required, so how can I allow for nulls (if no entry)?

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