In Eclipse Kepler (4.3) and Papyrus (4.3), I could not find a way to update the view (class diagram) of the model (Explorer model). If I created an operation by dragging the node operation from the palette to the class in the view, the operation was added to both the diagram and the model explorer.
You need to switch to the papyrus perspective to display the palette view.
I just wrote about this and a few more troubles . (I understand that this question is old enough that you most likely refused, but I found it when I was looking for a solution to the same problem.)
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