Flushes the executor's queue by iterating over the enqueued scripts, combining them into a single batch, executing them on the BBjHtmlView control.

The widget should call this method once when it is ready to begin the execution process. This is normally this done after the 'ON_PAGE_LOADED' event has fired. If this method isn't explicitly called by the widget, then it will be called automatically after the Rate timer has expired, which is 200 milliseconds by default. The executor will continue to flush the queue whenever it is needed.