help:CheckboxGroup can not be displayed thanks!!!
ie no indication error,But the display is blank

this is my code:
private void BindCheckBox(int RoleID)
    {
        Tab1.Title = "RoleID:" + RoleID;
        Accounts GetTree=new Accounts();
        DataSet TreeDS = GetTree.GetAllTree(RoleID);
        DataTable dt = TreeDS.Tables[0];
        DataRow[] Pardrs = dt.Select("TParentID=0");
        int xClass = 1;
        foreach (DataRow p in Pardrs)
        {
            if (Pardrs.Length > 0)
            {
                Coolite.Ext.Web.Anchor chganc = new Anchor();
                chganc.Horizontal = "99%";
                FormLayout1.Anchors.Insert(0, chganc);
                Coolite.Ext.Web.CheckboxGroup tempckg = new CheckboxGroup();
                tempckg.FieldLabel = p["TName"].ToString();
                tempckg.ID = "ckgroup" + p["TID"].ToString();
                if (Convert.ToBoolean(xClass % 2))
                {
                    tempckg.LabelCls = "xheckgroup";
                }
                chganc.Items.Add(tempckg);
                xClass++;
                DataRow[] drs = dt.Select("TParentID= " + p["TID"].ToString());
                if (drs.Length > 0)
                {
                    foreach (DataRow r in drs)
                    {
                        Coolite.Ext.Web.Checkbox ckbox = new Checkbox();
                        ckbox.ID = "ckbox" + r["TID"].ToString();
                        ckbox.Note = r["TID"].ToString();
                        ckbox.NoteCls = "notshow";
                        ckbox.BoxLabel = r["TName"].ToString();
                        if (r["isinc"].ToString()!="")
                        {
                            ckbox.Checked = true;
                        }
                        else
                        {
                            ckbox.Checked = false;
                        }
                        tempckg.Items.Add(ckbox);
                    }
                }
                Window1.Show();
            }
        }
    }