how to get boundary of polygons?

[jianhuizhou]

Hi,Everyone
I have a polygon by QueryTask.I want to fill this polygon with a color but another color for it's  boundary .
So I want to know how to get the boundary of polygon and return a ployline.

Thanks!

[RobertScheitlin__GISP]

jianhui,

   All you do is assign a new SimpleLineSymbol to the outline property of the SimpleFillSymbol for the graphic you are trying to change.

<esri:SimpleLineSymbol id="sline" style="solid" color="0x448ccb" width="2" alpha="0.8"/>
<esri:SimpleFillSymbol id="spoly" style="solid" color="0x448ccb" alpha="0.4" outline="{sline}"/>

[jianhuizhou]

Thanks !
I have found this method.but my ploygon is combined from multiple polygon,I don't want all the boundary but the combined polygon's.
Any idea?