Bug in a table properties dialog

[Ivan <Ivan-Sun1(at)mail(dot)ru>]

Hello,

Another bug in a table properties dialog:
Once i've added a new column in columns tab
i can't change properties of this column -
button is disabled -
(but can do for other columns) - so i need
to remove and then create again column if
i made a mistake while adding column

-- 
Best regards,
 Ivan                          mailto:Ivan-Sun1(at)mail(dot)ru