Ok, I tried to create a seperate "SelectionStates" group, but the results are the same. This line symbol does not seem to be used. The results are still shown in the original color defined in the service.
<esri:SimpleLineSymbol x:Key="ResultsLineSymbol" Color="Red" Width="3">
<esri:SimpleLineSymbol.ControlTemplate>
<ControlTemplate x:Name="CustomLineTemplate">
<Grid>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal">
</VisualState>
<VisualState x:Name="MouseOver">
<Storyboard>
<ColorAnimation
BeginTime="0:0:0"
Storyboard.TargetName="SymbolGeom"
Storyboard.TargetProperty="(Line.Fill).(SolidColorBrush.Color)"
To="Yellow"
Duration="0:0:0">
</ColorAnimation>
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="SelectionStates">
<VisualState x:Name="Selected">
<Storyboard>
<ColorAnimation
BeginTime="0:0:0"
Storyboard.TargetName="SymbolGeom"
Storyboard.TargetProperty="(Line.Fill).(SolidColorBrush.Color)"
To="Yellow"
Duration="Forever">
</ColorAnimation>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Line x:Name="SymbolGeom" Width="3">
<Line.Fill>
<SolidColorBrush x:Name="theColor" Color="Aqua"></SolidColorBrush>
</Line.Fill>
</Line>
</Grid>
</ControlTemplate>
</esri:SimpleLineSymbol.ControlTemplate>
</esri:SimpleLineSymbol>
In my code behind, I use the line
feature.Symbol = LayoutRoot.Resources["ResultsLineSymbol"] as LineSymbol;
to assign the desired line symbol to the features to be drawn on the graphics layer. In the map service, the line are red. After a selection, I would expect the lines to be Aqua.
