c# devexpress 多个窗口

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace multiplePanel
{
    public partial class Form1 : DevExpress.XtraEditors.XtraForm
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
             xtraTabbedMdiManager1.MdiParent = this;   //设置控件的父表单..
            Form2 frm = new Form2();

            frm.MdiParent = this;    //设置新建窗体的父表单为当前活动窗口
            frm.Text = "第一个子窗口";
            frm.Show();

            Form3 frm1 = new Form3();

            frm1.MdiParent = this;    //设置新建窗体的父表单为当前活动窗口
            frm1.Text = "第2个子窗口";
            frm1.Show();
            xtraTabbedMdiManager1.SelectedPage = xtraTabbedMdiManager1.Pages[frm];    //使得标签的选择为当前新建的窗口

            this.xtraTabbedMdiManager1.ClosePageButtonShowMode = DevExpress.XtraTab.ClosePageButtonShowMode.InAllTabPagesAndTabControlHeader;    //设置标签后面添加删除按钮 ,  多个标签只需要设置一次..
            //ShowCloseButton = DevExpress.Utils.DefaultBoolean.False; //以此隐藏页面关闭按钮
        }

        private void xtraTabPage1_Paint(object sender, PaintEventArgs e)
        {

        }
    }
}

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 devexpress中 xtratabbedmdimanager和xtratabpage区别是什么？

常用：

1.TextEditor(barEditItem)取文本

string editValue = barEditItem1.EditValue.ToString();    //错误，返回null
 
string editValue = ((DevExpress.XtraEditors.TextEdit)barEditItem).EditValue.ToString();    //正确，返回文本框内容

2.ComboBoxEdit(barEditItem)添加Item

string item = "comboboxItem1";
((DevExpress.XtraEditors.Repository.RepositoryItemComboBox)this.barEditItem.Edit).Items.Add(item);

3.ComboBoxEdit(barEditItem)取文本

string itemValue = this.barEditItem.EditValue.ToString();

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参考：https://wenku.baidu.com/view/fe6cf7efba0d4a7302763a9e.html

http://www.fx114.net/qa-139-72117.aspx