I was trying to create a link between two anchor points . After the link is created the starting point and end point of the link are getting changed in some cases.

Here is the code.[code]
MainPage.cs
public partial class MainPage : UserControl
    {
       AnchorPattern apat1, apat2;
       public MainPage()
       {
           InitializeComponent();
           diagram.DefaultShape = Shapes.Rectangle;
           diagram.FontSize = 10.75;
           ShapeNode pb1, pb2, pb3, pb4, decb1, decb2;

           apat1 = new AnchorPattern(new AnchorPoint[]
{
new AnchorPoint(50, 0, true, true),
new AnchorPoint(100, 50, true, true),
new AnchorPoint(50, 100, true, true),
new AnchorPoint(0, 50, true, true)
});

           apat2 = new AnchorPattern(new AnchorPoint[]
{
new AnchorPoint(10, 0, true, false, MarkStyle.Circle, Brushes.Blue),
new AnchorPoint(50, 0, true, false, MarkStyle.Circle, Brushes.Blue),
new AnchorPoint(90, 0, true, false, MarkStyle.Circle, Brushes.Red),
new AnchorPoint(10, 100, false, true, MarkStyle.Rectangle),
new AnchorPoint(50, 100, false, true, MarkStyle.Rectangle),
new AnchorPoint(90, 100, false, true, MarkStyle.Rectangle),
new AnchorPoint(0, 50, true, true, MarkStyle.Rectangle)
});

           pb1 = new ShapeNode(diagram);
           pb1.Bounds = new Rect(38.4, 26.88, 96, 69.12);
           pb1.Shape = Shapes.Ellipse;
           pb1.Text = "Start";
           pb1.AnchorPattern = apat1;
           diagram.Nodes.Add(pb1);

           pb2 = new ShapeNode(diagram);
           pb2.Bounds = new Rect(76.8, 288, 96, 69.12);
           pb2.Text = "node 1";
           pb2.AnchorPattern = apat2;
           diagram.Nodes.Add(pb2);

           pb3 = new ShapeNode(diagram);
           pb3.Bounds = new Rect(268.8, 268.8, 96, 69.12);
           pb3.Text = "node 2";
           pb3.AnchorPattern = apat2;
           diagram.Nodes.Add(pb3);

           pb4 = new ShapeNode(diagram);
           pb4.Bounds = new Rect(307.2, 384, 96, 69.12);
           pb4.Shape = Shapes.Ellipse;
           pb4.Text = "End";
           pb4.AnchorPattern = apat1;
           diagram.Nodes.Add(pb4);

           decb1 = new ShapeNode(diagram);
           decb1.Bounds = new Rect(76.8, 134.4, 115.2, 76.8);
           decb1.Shape = Shapes.Decision;
           decb1.Text = "check 1";
           decb1.AnchorPattern = AnchorPattern.Decision1In3Out;
           diagram.Nodes.Add(decb1);

           decb2 = new ShapeNode(diagram);
           decb2.Bounds = new Rect(268.8, 115.2, 115.2, 76.8);

           decb2.Shape = Shapes.Decision;
           decb2.Text = "check 2";
           decb2.AnchorPattern = AnchorPattern.LeftInRightOut;
           diagram.Nodes.Add(decb2);

           DiagramLink link = new DiagramLink(diagram, decb1, decb2);
           diagram.Links.Add(link);

           var router = diagram.LinkRouter as QuickRouter;
           if (router != null)
               router.UBendMaxLen = 10;
           diagram.RoutingOptions.TriggerRerouting |= RerouteLinks.WhileCreating;
           diagram.RoutingOptions.Anchoring = Anchoring.Keep;
       }

       private void diagram_NodeCreated(object sender, NodeEventArgs e)
       {
           ShapeNode node = e.Node as ShapeNode;
           if (node == null)
               return;

           if (node.Shape == Shapes.Decision)
               node.AnchorPattern = AnchorPattern.Decision1In3Out;
           else
               node.AnchorPattern = apat2;
       }
      
    }



MainPage.xml

<UserControl x:Class="Servlight_Test.Dialogs.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:my="clr-namespace:MindFusion.Diagramming.Silverlight;assembly=MindFusion.Diagramming.Silverlight"
    Height="800"
    Width="800" >
    <Border
       CornerRadius="5">
         <Grid>
               <Grid.RowDefinitions>
                   <RowDefinition
                       Height="Auto" />
                   <RowDefinition />
               </Grid.RowDefinitions>               
         
           <my:Diagram
               Name="diagram"
               AllowUnconnectedLinks="True"
               NodeCreated="diagram_NodeCreated"               
               ShapeHandlesStyle="DashFrame"
               AlignToGrid="False"
               BackBrush="#FFE0E0E0"
               HorizontalAlignment="Stretch"
               VerticalAlignment="Stretch"
               LinkSegments="3"
               RouteLinks="True"
               AutoSnapLinks="True"
               AutoSnapDistance="10"
               DynamicLinks="True">
              
           </my:Diagram>
       </Grid>
      </Border>
     
</UserControl>
[/code]