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protected void btnAddItem_Click(object sender, EventArgs e)        {            int index = this.GetIndexVal();            //Ext.Net.FieldSet fieldSet = new Ext.Net.FieldSet            //{            //    ID = "fieldSet" + index,            //    Border = false            //};            HiddenField hf = new HiddenField            {                ID = "hidden" + index,            };            Ext.Net.Checkbox checkbox = new Ext.Net.Checkbox            {                ID = "checkbox" + index,            };            Ext.Net.FieldContainer fieldContainer = new Ext.Net.FieldContainer            {                ID = "fieldContainer" + index,                Layout = "HBoxLayout",                Border = false            };            Ext.Net.TextField itemField = new Ext.Net.TextField            {                ID = "itemField" + index,                FieldLabel = "项目",                LabelWidth = 50,                Text = "项目"            };            Ext.Net.TextField accountField = new Ext.Net.TextField            {                ID = "accountField" + index,                FieldLabel = "金额",                LabelWidth = 50,                Text = "金额"            };            fieldContainer.Items.Add(checkbox);            fieldContainer.Items.Add(itemField);            fieldContainer.Items.Add(accountField);            splitItemForm.AddTo(this.splitFieldSet);            //this.splitFieldSet.Items.Add(fieldContainer);            //fieldSet.Items.Add(fieldContainer);            //fieldSet.AddTo(this.splitFieldSet);            Panel1.Expand();            splitItemForm.Render();        }        private int GetIndexVal()        {            int idx = Convert.ToInt32(index) + 1;            index = idx.ToString();            this.Hidden1.Text = idx.ToString();            return idx;        }       /* protected void btnDelItem_Click(object sender, EventArgs e)        {            Ext.Net.Checkbox checkbox = new Ext.Net.Checkbox();            for (int i = 0; i < this.splitFieldSet.Items.Count; i++)            {                checkbox = (Ext.Net.Checkbox)this.splitFieldSet.Items[i].FindControl("checkbox" + i + "-inputEl");                Control control = this.Panel1.FindControl(this.btnSave.ID);                String btnSaveId = control.ID;            }        }          */

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