Hi,

This is not the default behavior of the Diagram control and this issue is probably caused by something you do in your application. Are you selecting nodes by some custom logic in a click handler for example? You can check if a node is a child of a container by calling the node.getContainer() method. To get nodes at the pointer location, you can use the diagram.getNodesAt method.

You can also send us a sample that reproduces the issue, so we can investigate.

Regards,
Lyubo