hope sb. can help me,please!3x a lot!

[oak_hj]

i am new to kdeveloper and be urgent(!!!) to use it to make GUI.
but i was confuscated about the main menubar.
when i want to add a popupmenu to the main menu,i write the following:
KPopupMenu* hello=new KPopupMenu;
menuBar()->insertItem(i18n"hello",hello);

but---there isn't any change when execution!
why???
i miss something???
3x for help please!
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