How can I create a GTK combobox with no relief? -

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How can I create a GTK combobox with no relief? -

i know can remove button's relief with

button.set_relief(gtk::relief_none); // gtkmm

or

gtk_button_set_relief(button, gtk_relief_none); // gtk

but there's no corresponding method combobox.

what's easiest way accomplish this?

combobox gtk gtkmm

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