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1. Create a Class Diagram. 2. Add a class to the diagram. 4. Add an operation to the class. 5. Select both that class and that operation in the Model tree in Project window. 6. Invoke popup menu. Result: Delete operation is disabled. It seems to be wrong, because Delete operation for that class is enabled.
If class is selected with the operation iside, context menu contain only Delete and this delete works on element under mouse cursor, so if context menu was invoked over the operation this operation will be removed if over free class space entire class will be removed. May be I miss smth, if so fell free to reopen the issue with more details.