For example use this little mxml Snippet, for sure its not a flex only problem. I played for a while with line joins and caps and i think thats the problem. Besides there are problems with rendering around the boundary. Has anybody an approach to deal with transform detailed line properties?
<?xml version="1.0" encoding="utf-8"?>
minimum="1" maximum="30" value="10"
dataTipPlacement="top"
tickColor="black"
snapInterval="1" tickInterval="10"
labels="{[hSlider.minimum, hSlider.maximum]}"
allowTrackClick="true"
liveDragging="true"
change="changeSize();"/>