How to change the expanderview's header color ( silverlight toolkit for windows phone)

Question

a simple question but annoying me  for days

What i want is to make  expanderview's header  and expanderview item have the same color when the expanderview is selected (the expenderview is in a listbox)

I have tried to change the foreground property,but  it didn't work.(If you set a inital value,it works,but I can't change it useing binding or c# code  )

Thanks very much.

This is part of my xaml code .

<ListBoxItem Name="listItem1">
                    <toolkit:ExpanderView Name="expanderView" Header="expanderview header" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="0,0,0,0"   
                                      Width="460" IsHitTestVisible="False" IsExpanded="{Binding ElementName=listItem1, Path=IsSelected}">
                       
                        <toolkit:ExpanderView.Items>
                        <TextBlock Name="expanderblock" Text="the first"/>
                        <TextBlock Text="the second"/>
                    </toolkit:ExpanderView.Items>                    
                </toolkit:ExpanderView>
                </ListBoxItem>

Answer 1

I have exactly the same problem can't solve it. Some Data bindings seems impossible to do. 

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Software Developer