private void btnDongTien_Left_LinkClicked(object sender, DevExpress.XtraNavBar.NavBarLinkEventArgs e)
        {
            pnMain.Controls.Clear();
            UC_DongTienChinh uc = new UC_DongTienChinh();

            uc.Dock = DockStyle.Fill;
            pnMain.Controls.Add(uc);
        }
        private void btnDongTienChinh_Above_ItemClick(object sender, ItemClickEventArgs e)
        {
            pnMain.Controls.Clear();
            UC_DongTienChinh uc = new UC_DongTienChinh();

            uc.Dock = DockStyle.Fill;
            pnMain.Controls.Add(uc);
        }