When I have a node, attached to another node (inside it in all my cases) when I click the inner node, rather than getting a NodeClick event raised, I instead get a selection box created.

I've set every property I could find...

SelectionOnTop
Selection.Locked
Selection.AllowMultipleSelection

I've tried handling events: NodeSelecting, and SelectionMoving and set e.Cancel = True, e.CancelDrag...

No matter what I do, instead of getting a nodeclicked event, I get a selection box. Is there a way I'm missing to totally disable this and get the event I want?

Ooops. That would be my fault. I was using a custom scrollviewer we have that was eating my left click and handling it so it never raised up to me.

I can't draw a selection box in the sample. Doesn't the control create a link when you start drawing from the attached node? It always draws a selection box if you hold down Ctrl, but that can be disabled by setting:

Diagram.ModifierKeyActions.Control = ModifierKeyAction.None;

It will also draw selection box if Behavior is set to Modify and you start drawing from a position that will not move or resize items.

In any case, you can derive from the Behavior class that most closely resembles the interaction mode you need, override StartDraw and check the base result - if the base class has returned an InteractionState(Selection, Create) object, you can return null instead to stop it.

Alternatively you could handle MouseMove and check Diagram.Interaction. If it is an InteractionState(Selection, Create) object, call Diagram.CancelDrag().

I hope that helps,
Stoyan

It draws the selection box by design if no other operation has started.

Check how it behaves if you set subNode.Locked = true instead of the AllowLinks properties. Then instead of selection the control would start drawing a link from the main node, which might work depending on what your usage scenario is.

Otherwise you will have to return null from a custom Behavior class to prevent the selection, or call CancelDrag. Alternatively you could keep the AllowLinks properties set to true, but call e.CancelDrag from the LinkCreating event if you detect that the link origin is an attached node.

I hope that helps,
Stoyan