python tkinter Listbox

[Von]

Hi all,
  I am building a simple tool using tkinter,and need  multiselection
checklist.I find that Listbox with option selectmode=tkinter.MULTIPLE could
do this for me.
But when I have two Listboxs,I do some selection with one,then do selection
with another one,the previous listbox get cleared.I wonder how to keep the
previous listbox selected.
Wish I explained clear.

Regards.
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