This method is called when any of the {@link #stateEvents} are fired.
@private
function(){
        var me = this,
            delay = me.saveDelay,
            statics, runner;

        if (!me.stateful) {
            return;
        }

        if (delay) {
            if (!me.stateTask) {
                statics = Ext.state.Stateful;
                runner = statics.runner || (statics.runner = new Ext.util.TaskRunner());

                me.stateTask = runner.newTask({
                    run: me.saveState,
                    scope: me,
                    interval: delay,
                    repeat: 1
                });
            }

            me.stateTask.start();
        } else {
            me.saveState();
        }
    }