Returns the checked items for this combobox.
        
        :return     items | [<str>, ..]

def setCheckedItems(self, items):
        """
        Returns the checked items for this combobox.
        
        :return     items | [<str>, ..]
        """
        if not self.isCheckable():
            return
        
        model = self.model()
        for i in range(self.count()):
            item_text = self.itemText(i)
            if not item_text:
                continue
            
            if nativestring(item_text) in items:
                state = Qt.Checked
            else:
                state = Qt.Unchecked
            
            model.item(i).setCheckState(state)