how to set maxValue of ext:SpinnerField at edit time of gridpanel

[architectsd]

I am working with Ext.Net 1.5I want to validate ext:SpinnerField at Edit time..I want to set ext:SpinnerField maxValue at runtime. \[code\]<ext:GroupingSummaryColumn Width="100" ColumnID="Qty" Header="Qty" Sortable="true" DataIndex="qty" Align="Right"> <Editor> <ext:SpinnerField ID="txtQty" runat="server" AllowBlank="false" MinValue="http://stackoverflow.com/questions/12706678/1"> </ext:SpinnerField></Editor> </ext:GroupingSummaryColumn>\[/code\]I want to set MaxValue of ext:SpinnerField when user edit value of grid panel cell.