如何让axWindowsMediaPlayer控件随窗体的拉伸而拉伸

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;namespace player
{
    /// <summary>
    /// Form1 的摘要说明。
    /// </summary>
    public class Form1 : System.Windows.Forms.Form
    {
        private AxWMPLib.AxWindowsMediaPlayer axWindowsMediaPlayer1;
        private System.Windows.Forms.MainMenu mainMenu1;
        private System.Windows.Forms.MenuItem menuItem1;
        private System.Windows.Forms.MenuItem menuItem2;
        private System.Windows.Forms.MenuItem menuItem3;
        /// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.Container components = null;        public Form1()
        {
            //
            // Windows 窗体设计器支持所必需的
            //
            InitializeComponent();            //
            // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
            //
        }        /// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (components != null) 
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }        #region Windows 窗体设计器生成的代码
        /// <summary>
        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
        /// 此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));
            this.axWindowsMediaPlayer1 = new AxWMPLib.AxWindowsMediaPlayer();
            this.mainMenu1 = new System.Windows.Forms.MainMenu();
            this.menuItem1 = new System.Windows.Forms.MenuItem();
            this.menuItem2 = new System.Windows.Forms.MenuItem();
            this.menuItem3 = new System.Windows.Forms.MenuItem();
            ((System.ComponentModel.ISupportInitialize)(this.axWindowsMediaPlayer1)).BeginInit();
            this.SuspendLayout();
            // 
            // axWindowsMediaPlayer1
            // 
            this.axWindowsMediaPlayer1.AllowDrop = true;
            this.axWindowsMediaPlayer1.Enabled = true;
            this.axWindowsMediaPlayer1.Location = new System.Drawing.Point(0, 0);
            this.axWindowsMediaPlayer1.Name = "axWindowsMediaPlayer1";
            this.axWindowsMediaPlayer1.OcxState = ((System.Windows.Forms.AxHost.State)(resources.GetObject("axWindowsMediaPlayer1.OcxState")));
            this.axWindowsMediaPlayer1.Size = new System.Drawing.Size(448, 336);
            this.axWindowsMediaPlayer1.TabIndex = 0;
            // 
            // mainMenu1
            // 
            this.mainMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
                                                                                      this.menuItem1});
            // 
            // menuItem1
            // 
            this.menuItem1.Index = 0;
            this.menuItem1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
                                                                                      this.menuItem2,
                                                                                      this.menuItem3});
            this.menuItem1.Text = "打开";
            // 
            // menuItem2
            // 
            this.menuItem2.Index = 0;
            this.menuItem2.Text = "打开文件";
            this.menuItem2.Click += new System.EventHandler(this.menuItem2_Click);
            // 
            // menuItem3
            // 
            this.menuItem3.Index = 1;
            this.menuItem3.Text = "关闭";
            this.menuItem3.Click += new System.EventHandler(this.menuItem3_Click);
            // 
            // Form1
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
            this.ClientSize = new System.Drawing.Size(448, 333);
            this.Controls.Add(this.axWindowsMediaPlayer1);
            this.MaximizeBox = false;
            this.Menu = this.mainMenu1;
            this.Name = "Form1";
            this.Text = "播放器";
            ((System.ComponentModel.ISupportInitialize)(this.axWindowsMediaPlayer1)).EndInit();
            this.ResumeLayout(false);        }
        #endregion        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main() 
        {
            Application.Run(new Form1());
        }        private void menuItem2_Click(object sender, System.EventArgs e)
        {
          OpenFile();
        }
        //打开文件
        private void OpenFile()
        {
            OpenFileDialog ofDialog = new OpenFileDialog();
            ofDialog.AddExtension = true;
            ofDialog.CheckFileExists = true;
            ofDialog.CheckPathExists = true;
            ofDialog.Filter = "MPG文件(*.mpg)|*.mpg|VCD文件(*.dat)|*.dat|Audio文件(*.avi)|*.avi|WAV文件 (*.wav)|*.wav|MP3文件 (*.mp3)|*.mp3|所有文件 (*.*)|*.*";
            ofDialog.DefaultExt = "*.mp3"; 
            if(ofDialog.ShowDialog() == DialogResult.OK)
            {
                this.axWindowsMediaPlayer1.URL=ofDialog.FileName;
            }
        }        private void menuItem3_Click(object sender, System.EventArgs e)
        {
            this.Close();
        }    }
}