private void mnTonKho_Click(object sender, RoutedEventArgs e)
{
ucTonKho tonkho = new ucTonKho();
pnlUC.Children.Clear();
pnlUC.Children.Add(tonkho);
}
private void BtnTonKho_ItemClick(object sender, ItemClickEventArgs e)
{
pnMain.Controls.Clear();
VaiTro_ChucNang pqtk = btnTonKho.Tag as VaiTro_ChucNang;
ucTonKho tk = new ucTonKho(pqtk, username);
tk.ThemNhatKyHeThong += ThemNhatKy_Main;
tk.Dock = DockStyle.Fill;
pnMain.Controls.Add(tk);
}