How do I update a label that is in a ControlTemplate of a Toolbar in WPF?

<Style x:Key="DocViewerToolBarStyle" TargetType="{x:Type ContentControl}">
   <Setter Property="Template">
     <Setter.Value>
           <ControlTemplate TargetType="{x:Type ContentControl}">
              <ToolBarTray... />
              <ToolBar.../>
              <Button../>
              <Button..>

             <Label x:Name="myStatusLabel"  .. />

<Label x:Name="myStatusLabel" Content={TemplateBinding MyStatusLabelProperty} ../>

<Label x:Name="myStatusLabel"  Content="{TemplateBinding Content}"/>

<DataTemplate DataType={x:Type viewmodel:MyToolBarViewModel}>
    <Label Content={Binding CurrentPage} />
    <Label Content={Binding TotalPages} ContentStringFormat="{}of {0}" />
</DataTemplate>

<ToolBar>
    <ContentPresenter Content={Binding <PathtoViewModel>} />
</ToolBar>