Hi

I have a chart that has a series which plots one or more custom markers. The user can select one of the markers to highlight and the intention is that the border thickness of the marker gets thicker when selected and that the marker jumps in front of other markers.

At present when I select the marker the thickness increases but the marker does not jump to the front.

(Here the red item is selected but remains behind the purple marker)

I have a template for the marker as follows:

<DataTemplate x:Key="CustomMarkerTemplate">
<Ellipse Cursor="Hand"
Fill="{Binding Item.SpectrumBrush}"
PreviewMouseDown="Ellipse_PreviewMouseDown"
Stroke="Black"
ToolTipService.ShowDuration="9999999">
<Ellipse.Style>
<Style TargetType="Ellipse">
<Setter Property="StrokeThickness"
Value="2" />
<Setter Property="Width"
Value="15" />
<Setter Property="Height"
Value="15" />
<Setter Property="Panel.ZIndex"
Value="0" />
<Style.Triggers>
<DataTrigger Binding="{Binding Item.IsVisible}"
Value="False">
<Setter Property="Visibility"
Value="Collapsed" />
</DataTrigger>
<DataTrigger Binding="{Binding Item.DataPoints}"
Value="{x:Null}">
<Setter Property="Visibility"
Value="Collapsed" />
</DataTrigger>
<DataTrigger Binding="{Binding Item.IsSelected}"
Value="True">
<Setter Property="StrokeThickness"
Value="3" />
<Setter Property="Width"
Value="20" />
<Setter Property="Height"
Value="20" />
<Setter Property="Panel.ZIndex"
Value="1" />
</DataTrigger>
</Style.Triggers>
</Style>
</Ellipse.Style>
</Ellipse>
</DataTemplate>

Note that the marker is bound to an "Item.IsSelected" property that sets the Panel.ZIndex property, however this does not appear to work.

Any Ideas?