C# winCE5.0开发右键效果解决方案

public int _x;
 public int _y;
 private void dataGrid1_MouseDown(object sender, MouseEventArgs e)
        {
            System.Drawing.Point Pt = new Point(e.X, e.Y);
            DataGrid.HitTestInfo Ht = dataGrid1.HitTest(Pt.X, Pt.Y);
            //this.dataGrid1.CurrentCell = new DataGridCell(Ht.Row, Ht.Column);
            //this.dataGrid1.Select(Ht.Row); 
            if (Ht.Row >= 0 && Ht.Column >= 0)
            {
                _x = e.X + 2;//记录鼠标当前坐标 
                _y = e.Y + 1;//同上（priorPoint前面已经声明） 
                SHRGINFO shr = new SHRGINFO();
                shr.cbSize = Marshal.SizeOf(typeof(SHRGINFO));
                shr.dwFlags = SHRGFLags.SHRG_RETURNCMD;
                shr.ptDownX = MousePosition.X - 2;
                shr.ptDownY = MousePosition.Y - 8;
                shr.hwndClient = GetActiveWindow();
                int ret = SHRecognizeGesture(ref shr);
                if (ret == 1000)
                {
                    timer1.Enabled = true;//开启计时器
                }
            }
        }
 internal struct SHRGINFO
        {
            public int cbSize;
            public IntPtr hwndClient;
            public int ptDownX;
            public int ptDownY;
            public SHRGFLags dwFlags;
        }
        [Flags]
        internal enum SHRGFLags
        {
            SHRG_RETURNCMD = 0x00000001,
            SHRG_NOTIFYPARENT = 0x00000002,
            SHRG_LONGDELAY = 0x00000008,
            SHRG_NOANIMATION = 0x00000010,
        }
        [DllImport("aygshell")]
        extern private static int SHRecognizeGesture(ref SHRGINFO shr);
        [DllImport("coredll.dll", SetLastError = true)]
        public static extern IntPtr GetActiveWindow();  

private void timer1_Tick(object sender, EventArgs e)
        {
            string pids = this.dataGrid1[this.dataGrid1.CurrentRowIndex, 0].ToString();
            if (pids != "")
            {
                contextMenu1.Show(dataGrid1, new Point(_x, _y));//弹出上下文菜单  
                timer1.Enabled = false;
            }
        }