mmw

thanks for your tutorial.
i used your way of sorting a listview in a small music player
and for most of the columns it worked properly.
but when i try to sort a column that contains the duration data of the single tracks,
the application freezes for some seconds and the item order remains the same (only the arrow in the header changes its direction).
the string format of the items' content is like this:

03:00
02:43
04:20
...
-->(mm/ss)

do you know a solution for this issue?