Symbol rotation change by attribute update

TobiasJohansson

How can I update the rotation of the symbol in the map after the attribute the rotation is bound to is updated?
I've tried using 2 methods for rotating the symbol:
Morten's Surrogate Binder
And plain xaml:
<Grid.RenderTransform>
    <RotateTransform Angle ="{Binding Attributes[ROTATION]}" />
</Grid.RenderTransform>

If I change the symbol after updating the rotation attribute value, the new symbol will have the correct rotation.
Is it possible to do this somehow  without having to change symbol? Could this be because the Attributes-property of Graphic is not registered as a DependencyProperty?

PhilPonce

Morten,
I have a symbol that is placed at the correct angle using:

                Symbol symb = LayoutRoot.Resources["rotateSymbol"] as Symbol;
                Graphic g = new Graphic()
                {
                    Geometry = new ESRI.ArcGIS.Client.Geometry.MapPoint(location[0], location[1]),
                    Symbol = symb
                };
                g.Attributes.Add("Heading", location[2]-90);
                g.SetZIndex(10);
                symbolGraphic = g;
                videoLayer.Graphics.Add(symbolGraphic);

As I move the symbol along a line I want to change the rotation using:


  symbolGraphic.Attributes["Heading"] = location[2]-90;
  symbolGraphic.Geometry = new ESRI.ArcGIS.Client.Geometry.MapPoint(location[0], location[1]);

The point moves smoothly across the screen, but does not honor the rotation.  Can you direct me on what I'm missing?

Thanks

Symbol Definition:

<esriSymbols:MarkerSymbol OffsetX="10" OffsetY="10" x:Key="rotateSymbol">
                <esriSymbols:MarkerSymbol.ControlTemplate>
                    <ControlTemplate>
                        <Grid RenderTransformOrigin=".5,.5" local:SurrogateBinder.Angle="{Binding Path=Attributes, Converter={StaticResource dictConverter}, ConverterParameter=Heading}">
                            <Grid.RenderTransform>
                                <RotateTransform />
                            </Grid.RenderTransform>

                            <Ellipse Width="20" Height="20" Fill="Yellow" Stroke="Black" StrokeThickness="2" />
                            <TextBlock Text="-&gt;" FontWeight="Bold" FontSize="10" HorizontalAlignment="Center" VerticalAlignment="Center" />
                        </Grid>
                    </ControlTemplate>
                </esriSymbols:MarkerSymbol.ControlTemplate>
            </esriSymbols:MarkerSymbol>