Occurs when the user removes a single file from the list of files to upload (when clicks on button ).

Parameters:

realName- (string) the real name of the file (as it's displayed in the control)
serverName - (string) the file name that the server returns after uploading or null if the file wasn't uploaded to the server

myform.attachEvent("onFileRemove",function(realName,serverName){
    //any custom logic here
});