Double clicking action on Incoming entry in Call Hierarchy panel inconsistent to Type Hierarchy panel

When I double click on an entry in the Type Hierarchy panel it will refresh the Type Hierarchy for the double-clicked element.

When I double click on an Incoming entry in the Call Hierarchy it does not refresh the Hierarchy for the double clicked element but expands the element (shows possible childs).

To expand a tree in the Type Hierarchy panel you must click on the expand/tree indicator (triangle).

I would like to see the same user interaction in both Hierarchy panels.