private void picAddLoaiNguyenLieu_Click(object sender, EventArgs e) { urcDanhSachLoaiNguyenLieu urcLoaiNguyenLieu = new urcDanhSachLoaiNguyenLieu(); urcLoaiNguyenLieu._ReloadDSNguyenLieu = new urcDanhSachLoaiNguyenLieu.ReLoadDSNguyenLieu(_reloadAllCbb); if (!this.Controls.ContainsKey("urcLoaiNguyenLieu")) { this.Controls.Add(urcLoaiNguyenLieu); urcLoaiNguyenLieu.BackColor = Color.White; urcLoaiNguyenLieu.Top = 0; urcLoaiNguyenLieu.Left = 0; } urcLoaiNguyenLieu.BringToFront(); }