c1gridview 列宽问题，求解决方法

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在c1gridview中不能设置列绝对列宽，如下，滚动条不会出现，而是把每列宽度按比例缩小

<wijmo:C1GridView ID="C1GridView1" runat="server" AllowClientEditing="True"
            AllowColSizing="True" AutogenerateColumns="False" HighlightCurrentCell="True"
            ScrollMode="Auto" ShowFooter="False" UseAccessibleHeader="true" Width="600px">
            <Columns>
                  <wijmo:C1BoundField DataField="ccode"
                     HeaderText="第一列" Width="500px">
                  </wijmo:C1BoundField>
                  <wijmo:C1BoundField DataField="ccode_name" HeaderText="第二列" Width="300px">
                  </wijmo:C1BoundField>
                  <wijmo:C1BoundField DataField="igrade" HeaderText="第三列" Width="100px">
                  </wijmo:C1BoundField>
                  <wijmo:C1BoundField DataField="dend" HeaderText="第四列" Width="500px">
                  </wijmo:C1BoundField>
            </Columns>
            <HeaderStyle Font-Size="9pt" Height="25px" Wrap="False" />
            <RowStyle Font-Size="10pt" Height="23px" Wrap="False" />
         </wijmo:C1GridView>
      </ContentTemplate>