Enable pasting value for MaskedTextField (Vaadin 6)

I have a form with MaskedTestField. I can edit this field, can copy value from it but I can’t paste value from buffer, Ctrl+V doesn’t work (Ctrl+C works fine). I tried to add listener for this field on value changing but I can’t get value from event, stored in buffer.

How can I enable pasting value for this field?