“tickLableRotation” property can not work as expected

Component: SamplesTests
Build: javafx8u20b18
PlatForm: Mac OS

Steps(the test case is tests/samples/Ensemble8_05_Charts_Bar.html):
1.Select Samples/Charts/Bar/ImageBarChart node from the samples navigation tree.
2.The chart will show like Bar_1.png.
3.We try to change the “tickLableRotation” property of xAxis by dragging the slider, change the value as 91, but the tickLabel does not rotate. Please refer to Bar_2.png.
4.Then we change the “tickLableRotation” property of yAxis, change the value as 50, the yAxis tickLabel will rotate, at the same time, xAxis tickLabel will rotate too. Please refer to Bar_3.png. It is the bug.