🚀 go-pugleaf

Hi,
I'w writing an application which contains a JTree. The nodes of the tree
contain dates (mm/dd/yyyy) and are editable. If the selection is changed
while a node is being edited the pending changes should be saved. (I
achieved this by extendeding JTree and setting the protected field
'invokesStopCellEditing' to true.)
But what if the pending changes are illegal, i.e. the date entered is
invalid? I want to do the validity checking, both when editing is
finished by pressing the enter key and when it's finished by changing
the selection.
(I don't want to let the user go away until he provides something valid
or aborts.)

Do you have any ideas how to do this?

Thank you,

Roland