delphi主i窗口中实现多页面管理效果

MainForm上加PageControl1,把PageControl1的DockSite设为True, 把窗口FB_orderManage的DragKind设为dkDock,  DragMode设为dmAuromatic 
在MainForm中调用： 

FB_orderManage:= TFB_orderManage.Create(self);
FB_orderManage.ManualDock(PageControl1,nil,alclient);
FB_orderManage.FormStyle:=fsStayOnTop;
FB_orderManage.Show;
FB_orderManage.Visible := True;