解决Delphi MDI 闪烁问题

procedure TMainForm.CreateMDIChild(const Name: string);  
var 
Child: TMDIChild;  
begin 
{ create a new MDI child window } 
Perform(WM_SETREDRAW, 0, 0); //锁屏幕  
Child := TMDIChild.Create(Application);  
Child.WindowState := wsMaximized; //假设在这里将新建的子窗体设为最大化  
//或设置子窗体的Width和Height都可以  
Child.Caption := Name;  
if FileExists(Name) then Child.Memo1.Lines.LoadFromFile(Name);  
Perform(WM_SETREDRAW, 1, 0); //解锁屏幕并重画  
RedrawWindow(Handle, Nil, 0, RDW_FRAME + RDW_INVALIDATE +  
RDW_ALLCHILDREN + RDW_NOINTERNALPAINT);  
end;