Nested Elements by UseRelation

Actually I'm trying to make a simple Deploymentdiagramm. I have following model (similar to UML metamodel):
And I made a simple Diagrammtype:
This give me the following Domaineditor:
What i realy want is, that the nestedNode is showing as a compartment (inside) of the surrounding node. I tried with UseRelation, but then it's not possible to drop the element inside of a node. How it can be done?
And I made a simple Diagrammtype:
This give me the following Domaineditor:
What i realy want is, that the nestedNode is showing as a compartment (inside) of the surrounding node. I tried with UseRelation, but then it's not possible to drop the element inside of a node. How it can be done?