Oracle fusion middleware - Reports 11g - graph background color

Question

I have created a graph in oracle reports 10G/11G for the following query.

Select object_type,count(*) from user_objects group by object_type

In 10g I have got the graph with white background where as in 11g I have got the graph with gradient effect.I have changed the plot area background (with white color) also but there is no change in background.

Graph settings code in 10G is

   <rw:graph id="CT_1" src="G_object_type" groups="object_type" dataValues="count_">
<!--
<?xml version="1.0" ?>
<Graph version="3.2.0.22"/>
-->
</rw:graph>

Graph settings code in 11G

<rw:graph id="CT_1" src="G_object_type" groups="object_type" dataValues="count_">
<!--
<?xml version="1.0" ?>
<Graph version="11.1.1.0" customLayout="" seriesEffect="SE_NONE">
<PlotArea fillColor="#ffffff" fillTransparent="false"/>
<ThreeDFloor fillColor="#ffffff" fillTransparent="false"/>
<Y1Axis majorTickStepAutomatic="true"/>
<Y2Axis majorTickStepAutomatic="true"/>
</Graph>
-->
</rw:graph>

Let me know how to avoid this problem.