<esri:SimpleRenderer x:Name="SimplePointRender">I want to change the symbol of the schosen ones. Instead of yellow circles, I want to show a PIN symbol, something like:
<esri:SimpleRenderer.Symbol>
<esri:MarkerSymbol OffsetX="5" OffsetY="5">
<esri:MarkerSymbol.ControlTemplate>
<ControlTemplate>
<Ellipse x:Name="Element" Width="10" Height="10" Fill="Cyan" >
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="SelectionStates">
<VisualState x:Name="Unselected"/>
<VisualState x:Name="Selected">
<Storyboard>
<ColorAnimation Storyboard.TargetName="Element"
Storyboard.TargetProperty="(Ellipse.Fill).(SolidColorBrush.Color)"
To="Yellow" Duration="00:00:0.25"/>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
</Ellipse>
</ControlTemplate>
</esri:MarkerSymbol.ControlTemplate>
</esri:MarkerSymbol>
</esri:SimpleRenderer.Symbol>
</esri:SimpleRenderer>