tablelist and unknow

Hi
If I create a tablelist widget with "-movablecolumns 1" an I'll move a column it works ok.
But if I have a proc "unknown" I cann't move a column.
##
proc unknown {args} {puts "unknown : $args"}
##
If I move in the tablelistwidget a column I get:
% unknown : moveCol .tbl 2 1
But the position from the column don't change.
How can I solve the problem?
regards
Manfred