GridView字段选择器

可通过拖拽实现列的增加、删除

1.添加按钮、gridView、ObjectDataSource

2.修改按钮的属性（可直接在源里修改）

<dx:ASPxButton ID="btnSelect" runat="server" Text="显示字段选择器" AutoPostBack="False"            ClientInstanceName="cl_btnSelect">            <ClientSideEvents Click="cl_btnSelect_Click" />        </dx:ASPxButton>

3.添加javaScript代码

<script language="javascript" type="text/javascript">        function cl_btnSelect_Click(s, e) {            if (gvSourceInfo.IsCustomizationWindowVisible())                gvSourceInfo.HideCustomizationWindow();            else                gvSourceInfo.ShowCustomizationWindow();            UpdateButtonText();        }    </script>

4.修改GridView的属性