HeaderDropped Property

// The client event 'HeaderDropped' takes two parameters sender and e
// sender  is the object which is raising the event
// e is the HeaderDroppedEventArgs
function WebDataGrid_HeaderDropped(sender, e) {

    //Gets the column object you want to move
    var column = e.get_column();

    //Gets the key of the column
    var key = column.get_key();

    //Gets the index of the column
    var index = column.get_index();

    //Gest the index of the column where it will be dropped
    var targetIndex = e.get_targetIndex();

                             
 
}