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The UML project nodes such as "Model", "Diagrams", "Imported Elements" and the UML elements such as package, operations, attributes when double clicked on the lables, they donot expand. Instead, one has to click on the "+" symbol of the node. This is an usability issue and also the current behaviour is not consistent with the java project node behvaiour. If you double click on the lables of the java project, they just expand.
double click is used for navigation to these elements if used on any diagram