WPF给ListBox添加效果：鼠标滑过每项时背景色改变
类似VS2010中Toolbox的效果，鼠标滑过每一项的时候背景色都改变，给个思路或代码，刚学这个，什么都不会。
<ListBox Height="276" HorizontalAlignment="Left" Name="listBox1" VerticalAlignment="Top" Width="117">
<ListBoxItem>
<Expander Header="Area">
<StackPanel>
<StackPanel Orientation="Vertical">
<TextBlock>Ward</TextBlock>
</StackPanel>
<StackPanel Orientation="Vertical">
<TextBlock>Room</TextBlock>
</StackPanel>
</StackPanel>
</Expander>
</ListBoxItem>
<ListBoxItem>
<Expander Header="Terminal">
<StackPanel>
<StackPanel Orientation="Horizontal">
<TextBlock>Button1</TextBlock>
</StackPanel>
<StackPanel Orientation="Horizontal">
<TextBlock>Button2</TextBlock>
</StackPanel>
<StackPanel Orientation="Horizontal">
<TextBlock>Button3</TextBlock>
</StackPanel>
<StackPanel Orientation="Horizontal">
<TextBlock>Button4</TextBlock>
</StackPanel>
<StackPanel Orientation="Horizontal">
<TextBlock>Button5</TextBlock>
</StackPanel>
</StackPanel>
</Expander>
</ListBoxItem>
</ListBox>
