expression = editor.replaceExpression(expression, contentSource);
content.getCreationSupport().add_setSourceExpression(expression);
content.addRelatedNode(expression);
}
// set Association
content.setAssociation(new ConstructorChildAssociation());
// set VariableSupport
VariableSupport variableSupport = new EmptyVariableSupport(content, expression);
content.setVariableSupport(variableSupport);
// add content Panel as child
addChild(content);