procedure tform1.formcreate(...);
begin
  postmessage(self.handle,wm_user+100,0,0);
end;....
procedure wndproc(var testmsg:tmessage);
begin
   if testmsg.msg=wm_user+100 then
     begin
             form1.stringgrid1.cells[0,0]:='test1';
     end
end;
     form1.运行正常,但是没有显示test1
end;