Problem with add links

@Z.Tom wrote:

I want to add link between two nodes,so I set the go:Node.LinkableFrom="True" and go:Node.LinkableTo="True",but it doesn't work.It is very odd;Following is my xaml:

<go:DataTemplateDictionary x:Key="NodeTemplateDictionary">
<DataTemplate x:Key="NodeTemplate2">
                            <go:NodePanel Sizing="Auto"
      go:Part.SelectionAdorned="True" go:Part.SelectionElementName="ellipse">
                                    <go:NodeShape go:NodePanel.Figure="RoundedRectangle" x:Name="ellipse"
        Fill="Black" StrokeThickness="2"
        go:Node.LinkableFrom="True" go:Node.LinkableTo="True" go:Node.PortId="" go:Node.LinkableDuplicates="True"
         Cursor="Hand" />
                            </go:NodePanel>
                    </DataTemplate>
            </go:DataTemplateDictionary>

            <control:MyDiagram x:Name="myDiagram" Padding="10"   Grid.Row="1" Model="{Binding GVM,Mode=TwoWay}" FilterSelectedNodeIDs="{Binding FilterSelectedNodeIDs}"
		FilterSelectedEdgeIDs="{Binding FilterSelectedEdgeIDs}"
		InitialPanelSpot="Center" InitialDiagramBoundsSpot="Center"
		HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch"
                    InitialStretch="Uniform"
		LinkTemplate="{StaticResource LinkTemplate}"
                    Background="White"
                    NodeTemplateDictionary="{StaticResource NodeTemplateDictionary}"
                        >
                    <control:MyDiagram.Layout>
                            <local:CustomLayout
                    ArrangesToOrigin="True"
                        />
                    </control:MyDiagram.Layout>
                    <control:MyDiagram.CommandHandler>
                            <go:CommandHandler ZoomFactor="1.3"/>
                    </control:MyDiagram.CommandHandler>
                    <control:MyDiagram.DefaultTool>
                            <go:ToolManager WheelBehavior="Zooms"/>
                    </control:MyDiagram.DefaultTool>
                    <i:Interaction.Triggers>
                            <!--<i:EventTrigger EventName="MouseLeftButtonUp" >
                                    <i:InvokeCommandAction Command="{Binding MouseLeftUpCommand}" CommandParameter="{Binding ElementName=myDiagram}" />
                            </i:EventTrigger>-->
                            <i:EventTrigger EventName="MouseRightButtonUp">
                                    <i:InvokeCommandAction Command="{Binding MouseRightButtonUpCommand}" CommandParameter="{Binding ElementName=myDiagram}" />
                            </i:EventTrigger>
                            <i:EventTrigger EventName="MouseRightButtonDown">
                                    <i:InvokeCommandAction Command="{Binding MouseRightButtonDownCommand}" CommandParameter="{Binding ElementName=myDiagram}" />
                            </i:EventTrigger>
                    </i:Interaction.Triggers>

            </control:MyDiagram>

can any one help me?

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