code: func (v *TreeViewColumn) SetTitle(t string) {
  	cstr := (*C.gchar)(C.CString(t))
  	defer C.free(unsafe.Pointer(cstr))
  	C.gtk_tree_view_column_set_title(v.native(), cstr)
  }
docs: // SetTitle() is a wrapper around gtk_tree_view_column_set_title().