private void mainMenu_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e) { TreeMenuNode node = (TreeMenuNode)e.Node; MainMenuTag tag = (MainMenuTag)node.Tag; switch (tag.ID) { case MenuID.Setup_Country: Country cty = new Country(BOIDEnum.Country); cty.MdiParent = this.MdiParent; cty.Show(); break; case MenuID.Setup_Market: break; case MenuID.BP_MD: BPMD bpmd = new BPMD(BOIDEnum.BP); bpmd.MdiParent = this.MdiParent; bpmd.Show(); break; default: break; } }