不能用VisualStateManger添加按钮样式.VisualStateGroup到资源字典

我有使用VisualStateManger的按钮样式。目前这些样式在<Grid.Resources>和工作没有任何错误。我试图将这些样式移动到资源字典，它给出了以下错误。有人知道为什么style是在用户控制中工作，而当移动到资源字典时不工作吗?

标签'visualstatemanager. 'visualstategroups'在XML中不存在命名空间http://schemas.microsoft.com/winfx/2006/xaml/presentation

我使用的是。net 3.5

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:vsm="clr-namespace:System.Windows;assembly=wpftoolkit"
    xmlns:system="clr-namespace:System;assembly=mscorlib"
    >
    <Style x:Key="Home" BasedOn="{StaticResource PagingButton}" TargetType="{x:Type Button}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType='Button'>
                    <Border Name='border' Background='{StaticResource HomeButtonBackground}' CornerRadius='5,5,0,0'>
                        <VisualStateManager.VisualStateGroups>
                            <VisualStateGroup x:Name="CommonStates">
                                <VisualState x:Name="Normal" >
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(Border.Background)" Storyboard.TargetName="border">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource ButtonBackground}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="Pressed">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(Border.Background)" Storyboard.TargetName="border">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource ButtonBackgroundPressed}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                            </VisualStateGroup>
                        </VisualStateManager.VisualStateGroups>
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>    
</ResourceDictionary>

xmlns:vsm="clr-namespace:System.Windows;assembly=System.Windows"

<vsm:VisualStateManager.VisualStateGroups>
  <vsm:VisualStateGroup x:Name="CommonStates">
    <vsm:VisualState x:Name="MouseOver">
      <Storyboard>
        <ColorAnimation Storyboard.TargetName="tickBox"
            Storyboard.TargetProperty="(Rectangle.Fill).
                                (SolidColorBrush.Color)"
            To="PaleGreen" Duration="0:0:0.5" />
      </Storyboard>
    </vsm:VisualState>
  </vsm:VisualStateGroup>
</vsm:VisualStateManager.VisualStateGroups>