I am unable to delete an opertaion from a class diagram looks like a bug to me ,
steps to reproduce
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1) create a new Class diagram
2) add one class : MyClass
3) Add some operation / method: myMethod1() & myMethod2()
4) Add some attributes : myAttributes1 & myAttribute2
5) I can delete attributes if I want
6) cannot delete myMethod 1 or 2
if I am wrong there must be some other way to delete such methods from class diagram.