Hi, Please see my attachment solution zip.

please see JgbAppTreeView.xaml

<ig:XamDataTree x:Name="MyTree"
ItemsSource="{Binding Path=TreeNodes}"
>
<ig:XamDataTree.GlobalNodeLayouts>
<ig:NodeLayout Key="AppLayout"
TargetTypeName="EucAppTreeNodeViewModel"
DisplayMemberPath="Name">
</ig:NodeLayout>
<ig:NodeLayout Key="CategoryLayout"
TargetTypeName="CategoryTreeNodeViewModel"
DisplayMemberPath="Name">
</ig:NodeLayout>
<ig:NodeLayout Key="ReportLayout"
TargetTypeName="ReportTreeNodeViewModel"
DisplayMemberPath="Name">
</ig:NodeLayout>

</ig:XamDataTree.GlobalNodeLayouts>
</ig:XamDataTree>

the viewmodel is in another assembliy

It does not work now, could you please help me to take a look, how to set TargetTypeName value

Thanks a lot!