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

def checkedItems( self ):
        """
        Returns the checked items for this combobox.
        
        :return     [<str>, ..]
        """
        if not self.isCheckable():
            return []
        
        return [nativestring(self.itemText(i)) for i in self.checkedIndexes()]