I have a question regarding Group creation. When node source use an observable collection, and when I call method AddNodeForData then Group is created as expected. But when it’s a normal collection, I have to use method MakeNodeForData to be able to create a group. Unfortunately lots of properties …

Hi Walter, I think I’ve got it. A change in my node (for ex. SubgraphKey) has to be synchronized with Model Node Source via DoGroupNodeCHanged. Then if I process my list in the right order (from higher group to deeper group) everything look fine. Do you agree, the sorting process. If so can you …

If the NodesSource property value implements INotifyCollectionChanged, the model adds an CollectionChanged listener which calls GraphLinksModel.DoNodeAdded. So when you add data to the collection, the model is notified. If the NodesSource property value does not implement INotifyCollectionChanged,…

OK, I’ve never used GroupTemplateDictionary as I’ve only have 1 Group template. For testing, I’ve added a value String MyCategory in GraphLinksModelNodeData object. MyCategory = "GraphGroupTemplate"; I’ve added groupTemplate inside a DataTemplateDictionary: <gowpf:DataTemplateDictionary x:Key="G…

No, if there is only one template for Groups, you can just set Diagram.GroupTemplate and you won’t care about category. How does that data object declare itself to be a Group rather than a regular Node?

In Construtor property IsSubGraph is set to true.

So if you call GraphLinksModel.GetIsGroupForNode on that data object, it returns true, yet the Node that is created isn’t an instance of Group? If so, I cannot explain that.

GraphLinksModel.GetIsGroupForNode return false [image] with data object: public class GraphNodeViewModel : GraphLinksModelNodeData and model new GraphLinksModel<GraphNodeViewModel, string, string, GraphConnectionViewModel>();

OK, well, that method returning false explains why the Node isn’t also a Group. But why GetIsGroupForNode is returning false for that object when its IsSubGraph property is true, is very odd to me. You already said that GraphLinksModel.NodeIsGroupPath is “IsSubGraph”, so it isn’t that the model is…

[image] GraphLinksModel.NodeIsGroupPath = “IsSubGraph”

Are you still calling PartManager.MakeNodeForData, even though you probably shouldn’t be? That is the method that actually constructs either a new Node or a new Group, depending on the isgroup argument. It is only called by PartManager.AddNodeForData, as I explained above.

Nope, I do not call MakeNodeForData anymore. I only call AddNodeForData (As it is in Virtualization example), as you told me. The only difference between working and not working code is the collection declaration.

Northwoods Software

Creating Groups

GoXam

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