WPF Cannot Capture Mouse events in Nested CustomControls - wpf

Question

I have the following Control template in my app.xaml: (it is in a template setter in a style, so there is no key)
<ControlTemplate TargetType="{x:Type vm:State}">
<Grid Width="100" Height="60" >
<Border Margin="4"
IsHitTestVisible="{Binding ElementName=Radio_Edit02, Path=IsChecked}"
Padding="4"
BorderBrush="White"
BorderThickness="2"
CornerRadius="5">
<ContentPresenter HorizontalAlignment="Center"
VerticalAlignment="Center"
Content="{Binding ItemName, RelativeSource={RelativeSource TemplatedParent}}"/>
</Border>
<Grid Margin="3" Background="Transparent">
<local:Anchor Width="6" Height="6" HorizontalAlignment="Center" VerticalAlignment="Top" Background="Red" Visibility="{Binding IsChecked, ElementName=Radio_Edit03, Converter={StaticResource bool2vizibility}}"/>
<local:Anchor Width="6" Height="6" HorizontalAlignment="Right" VerticalAlignment="Center" Background="Red" Visibility="{Binding IsChecked, ElementName=Radio_Edit03, Converter={StaticResource bool2vizibility}}"/>
<local:Anchor Width="6" Height="6" HorizontalAlignment="Left" VerticalAlignment="Center" Background="Red" Visibility="{Binding IsChecked, ElementName=Radio_Edit03, Converter={StaticResource bool2vizibility}}"/>
<local:Anchor Width="6" Height="6" HorizontalAlignment="Center" VerticalAlignment="Bottom" Background="Red" Visibility="{Binding IsChecked, ElementName=Radio_Edit03, Converter={StaticResource bool2vizibility}}"/>
</Grid>
</Grid>
</ControlTemplate>
State derives from thumb
public class State : Thumb, INotifyPropertyChanged
Anchor derives from UserControl
public class Anchor : UserControl, INotifyPropertyChanged
I want to capture a click of the State at one point in the app and of the Anchor in another point of the app.
I want to control when by the two radiobuttons, Radio_Edit02 & Radio_Edit03
when Radio_Edit02 is selected I want to capture the click on the border
when Radio_Edit03 is selected I want to capture the click on the anchor.
I keep getting the click event on the State and cannot get a click on the Anchor.
I tried adding IsHitTestVisible="{Binding ElementName=Radio_Edit03, Path=IsChecked}" to the anchor
but no luck
I tried the following assignement of event handlers in Anchor but neither worked
public Anchor() //constructor
{
//this//this.MouseLeftButtonUp += onAnchorSelect;
//this.PreviewMouseLeftButtonUp += onAnchorSelect;
}
signature for onAnchorSelect is
public void onAnchorSelect(object sender, MouseButtonEventArgs e)
How can I capture a click on the Anchor so that e.Source is the anchor element
thanks