i managed to build a dual thumb slider that i pass on the filter function. here is the code.
<mx:HSlider x="0" y="240" id="priceSlider" minimum="0" maximum="3000000" tickInterval="100000" snapInterval="10" thumbCount="2" values="[0,3000000]" tickColor="#ffffff" labels="[$0k,$3000000M]" liveDragging="true" width="182" change="filterGrid()"/>

