Dialog size problem

[mailaxe 263 net]

I am puzzled by this:
          I create a dialog from my main window(gtk_dialog_new()),but
when I show it with modal, the size of the dialog equals that of the main window.
          I tried to make the size changed by calling gtk_widget_set_usize() and gtk_window_set_default_size(), but they don't seem to work.
          Could anyone please show me the reason?
          Thanks!

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