窗口显示问题！

Question

childmidform:=Tchildmidform.Create(Application);

Answer 1

因为你将midchild窗口改为自己创建了。(availabel form)
midchild:=tmidchild.create(application);
midchild.showmodal;

Answer 2

childmidform:=Tchildmidform.Create(Application);

Answer 3

dajianshi(大剑师) :那应该如何创建呢!?

Answer 4

var
  midchild:tmidchild;
begin
 midchild:=tmidchild.create(application);
 midchild.showmodal;
end;