Hi Peter Stoev,
thanks for your help.
The reason why I need to destroy the grid is that when I search data,
the columns changes(more or less by search conditions: “start date” and “end date”).
For example:
Init: “start date” =2013/10/17 , “end date”=2013/10/18
there would be two columns named by date;
when I change “end date” to 2013/10/19 and click “search” button,
get data and call “updatebounddata” method,
the data refreshed but there still two columns, not three as expected.
The only way I found was to destroy the grid and rebuild it ,
do you have any better ideas?