private void barButtonItem5_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e) { TransaksiPenjualan form = TransaksiPenjualan.GetForm(); form.MdiParent = this; var IsSuccess = form.PopulateData(); if (!IsSuccess) { MessageBox.Show("Buat terlebih dahulu Pelanggan dengan member berdiskon 0 (nol)", "Error", MessageBoxButtons.OKCancel, MessageBoxIcon.Warning); return; } form.Show(); form.Activate(); }