select and delete array elements using mouse events

Hi,

I am trying to write code that will allow the user to select or delete array elements from one array into another array. i.e choose which files will be used in some later analysis. The select works ok (using mouse to select from the "available files" array), but my delete section requires an extra mouse click before updating the "trials to use array", this causes a lag.

I really can't see why the two events are handled differently in terms of updating the "trials to use array".

Please help!

Thanks

Graham