Flex different behaviour when expanding and shrinking browser window

I am having component, which resizes with respect to browser window. Initially I was redrawing it like this:

    override protected function updateDisplayList(unscaledWidth, unscaledHeight):void
    {
      if(_draw)
      {
...........
        draw(unscaledWidth, unscaledHeight)
      }
    },

where _draw depends on whether width, height or dataProvider changes. It draws too much, though (lots of redraws from initial to final width/height). I added timer then:

_timer = new Timer(_delay);
    override protected function updateDisplayList(unscaledWidth, unscaledHeight):void
    {
      if(_draw)
      {
...........
        _timer.reset();
        _timer.start();
      }
    },

where handler of Timer event stops the timer and does the drawing. It works fine while I am increasing the size of the browser, but draws things immediately when I decrease it(browser window). Any ideas?

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