hg: openjfx/8/controls/rt: fix RT-23812 StackedAreaChart ClassCastException on CategoryAxis

[hang.vo at oracle.com]

Changeset: d811a42d75ba
Author:    Paru Somashekar <paru.somashekar at oracle.com>
Date:      2012-10-18 12:57 -0700
URL:       http://hg.openjdk.java.net/openjfx/8/controls/rt/rev/d811a42d75ba

fix RT-23812 StackedAreaChart ClassCastException on CategoryAxis
+ unit test.

! javafx-ui-charts/src/javafx/scene/chart/StackedAreaChart.java
! javafx-ui-charts/test/javafx/scene/chart/StackedAreaChartTest.java