>Hi Tamar,
> Thanks for your response. I looked in Hack Fox 6 and 7 but couldn't find the reference--thanks for tracking it down. So are you are saying that what I observed is in fact how the control behaves? Is there any workaround? If not, I guess I will have to use a different control, maybe a grid with a checkbox?

Hi Chaim,

I prefer multiselect grid. See Two grid classes File #9361, for example.