sl4 toolkit图表控件显示双y轴

下面是页面代码

<UserControl xmlns:toolkit="http://schemas.microsoft.com/winfx/2006/xaml/presentation/toolkit"  x:Class="SilverlightApplication2.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
               xmlns:local="clr-namespace:SilverlightApplication2"
    d:DesignHeight="300" d:DesignWidth="400" >

    <Grid x:Name="LayoutRoot" Background="White">
        <Grid.Resources>
            <local:EngineMeasurementCollection x:Key="EngineMeasurementCollection"/>
        </Grid.Resources>
        <toolkit:Chart>
            <!-- Power curve  -->
            <toolkit:LineSeries
                            Title="Power"
                           ItemsSource="{StaticResource EngineMeasurementCollection}"
                            IndependentValueBinding="{Binding Speed}"
                            DependentValueBinding="{Binding Power}">
                <!--MarkerWidth="5"
                            MarkerHeight="5"-->
                <!-- Vertical axis for power curve  Orientation="Vertical"-->
                <toolkit:LineSeries.DependentRangeAxis>

                    <toolkit:LinearAxis
                         
                                     Orientation="y"
                                    Title="Power (hp)"
                                    Minimum="0"
                                    Maximum="250"
                                    Interval="50"
                                    ShowGridLines="True"/>
                </toolkit:LineSeries.DependentRangeAxis>
            </toolkit:LineSeries>
            <toolkit:ColumnSeries   Title="Power"
                           ItemsSource="{StaticResource EngineMeasurementCollection}"
                            IndependentValueBinding="{Binding Speed}"
                            DependentValueBinding="{Binding Power}">
                <toolkit:ColumnSeries.DependentRangeAxis>
                    <toolkit:LinearAxis    Orientation="y"
                                    Title="Power (hp)"
                                    Minimum="0"
                                    Maximum="250"
                                    Interval="50"
                                    ShowGridLines="True"></toolkit:LinearAxis>
                </toolkit:ColumnSeries.DependentRangeAxis>
            </toolkit:ColumnSeries>
            <!-- Torque curve  -->
            <toolkit:LineSeries
                            Title="Torque"
                           ItemsSource="{StaticResource EngineMeasurementCollection}"
                            IndependentValueBinding="{Binding Speed}"
                            DependentValueBinding="{Binding Torque}">
                <!--MarkerWidth="5"-->
                <!--MarkerHeight="5"-->
                <!-- Vertical axis for torque curve  Orientation="Vertical"-->
                <toolkit:LineSeries.DependentRangeAxis>
                    <toolkit:LinearAxis
                                   Orientation="Y"
                                    Title="Torque (lb-ft)"
                                    Minimum="50"
                                    Maximum="300"
                                    Interval="50"/>
                </toolkit:LineSeries.DependentRangeAxis>
            </toolkit:LineSeries>
            <toolkit:Chart.Axes>
                <!-- Shared horizontal axis Orientation="Horizontal"-->
                <toolkit:LinearAxis
                                Orientation="X"
                                Title="Speed (rpm)"
                                Interval="1000"
                                ShowGridLines="True"/>
            </toolkit:Chart.Axes>
        </toolkit:Chart>
    </Grid>
</UserControl>

数据类EngineMeasurement

 public class EngineMeasurement
    {
        public int Speed { get; set; }
        public int Torque { get; set; }
        public int Power { get; set; }
    }

数据集合EngineMeasurementCollection

 public class EngineMeasurementCollection : Collection<EngineMeasurement>
    {
        public EngineMeasurementCollection()
        {
            Add(new EngineMeasurement { Speed = 1000, Torque = 100, Power = 20 });
            Add(new EngineMeasurement { Speed = 2000, Torque = 160, Power = 60 });
            Add(new EngineMeasurement { Speed = 3000, Torque = 210, Power = 125 });
            Add(new EngineMeasurement { Speed = 4000, Torque = 220, Power = 160 });
            Add(new EngineMeasurement { Speed = 5000, Torque = 215, Power = 205 });
            Add(new EngineMeasurement { Speed = 6000, Torque = 200, Power = 225 });
            Add(new EngineMeasurement { Speed = 7000, Torque = 170, Power = 200 });
        }
    }

 以上代码在silverlight4 vs2010 英文 

和Microsoft Silverlight 4 Toolkit April 2010  下调试通过