Hey there,

Here is the simplified code I use (the board screws code pasting up pretty much - so just c/p it into VS):      

static void Main(string[] args)

{

A root = new A { Config = "my root", Filters = new List<B>() };

B filter = new B { Filter = "foo", Items = new List<C>() };

C soloItem = new C { Name = "solo" };

C parent = new C { Name = "parent", Children = new List<C>() };

C child1 = new C { Name = "child1", Children = new List<C>() };

C child2 = new C { Name = "child2" };

C otherSolo = new C { Name = "solo2" };

filter.Items.Add(parent);

filter.Items.Add(child1);

filter.Items.Add(child2);

filter.Items.Add(soloItem);

filter.Items.Add(otherSolo);

parent.Children.Add(child1);

child1.Parent = parent;

child1.Children.Add(child2);

child2.Parent = child1;

/*

             * my root

             * --foo

* ----solo

             * ----child1

             * ------child2

             * ----solo2

             */

        }

    }

public class A

    {

public String Config { get; set; }

public List<B> Filters { get; set; }

    }

public class B

    {

public String Filter { get; set; }

public List<C> Items { get; set; }

public List<C> DisplayItems

        {

get

            {

return Items.Where(x => x.Parent == null).ToList();

            }

        }

    }

public class C

    {

public String Name { get; set; }

public C Parent { get; set; }

public List<C> Children { get; set; }

    }

A is the root and has a collection of B.
B has a collection of ALL C.
C can have a Parent C and a collection of Child C.

When displaying B, I want only Cs to appear which do not have a Parent. But those shall appear as Children of Cs.
To do so, B provides a wrapped property (DisplayItems) returing the filtered collection.

What i have so far is:

                <ig:XamDataTree.GlobalNodeLayouts>                     <ig:NodeLayout TargetTypeName="A" Key="a"/>                     <ig:NodeLayout TargetTypeName="B" Key="b"/>                     <ig:NodeLayout TargetTypeName="C" Key="c"/>                 </ig:XamDataTree.GlobalNodeLayouts>

I tried with nested NodeLayouts and Assigning keys... but the Result was pretty useless...

Can u help?