I have no idea how to use the FireCommandEvent. Actual the thing I want to do is after the user fill in the filter textbox the he/she will click a button ( instead of the default drop down list option) to trigger the filter action "contains"(but non case sensitive) , and there is another button for them to cancel the filter( same as "no filter" option), Would you please show me how can I do this with the FireCommandEvent? Thanks.