If you want change the color of lines in a dvt:lineChart because you don’t like the default colors of each chartDataItem. You can use a chartSeriesStyle inside seriesStamp.
I show a example below
<dvt:lineChart id="lc1" var="row" value="#{bindings.vo.collectionModel}" contentDelivery="immediate" styleClass="AFStretchWidth" zoomAndScroll="live" dataSelection="single" title="demo"> <f:facet name="dataStamp"> <af:group id="g1"> <dvt:chartDataItem id="di1" value="#{row.value1}" group="#{row.group}" series="custom1"/> <dvt:chartDataItem id="di2" value="#{row.value2}" group="#{row.group}" series="custom2" /> </af:group> </f:facet> <f:facet name="seriesStamp"> <af:group id="g2"> <dvt:chartSeriesStyle id="css2" series="custom1" color="#ff2121" lineStyle="solid" /> <dvt:chartSeriesStyle id="css3" series="custom2" color="#f2c779" lineStyle="solid"/> </af:group> </f:facet> </dvt:lineChart>