Bug 36514 call hierarchy: should remove 'search ... using ..' preferences
we should decide whether the answer should be true or false and remove the preference settings - no user will ever understand what the setting means
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/callhierarchy/CallHierarchyViewPart.java
DropTarget dropTarget = new DropTarget(fNoHierarchyShownLabel, ops | DND.DROP_DEFAULT);
        dropTarget.setTransfer(transfers);
        dropTarget.addDropListener(new CallHierarchyTransferDropAdapter(this, fCallHierarchyViewer));
    }
    
    private void addDropAdapters(StructuredViewer viewer, int ops, Transfer[] transfers){
        TransferDropTargetListener[] dropListeners= new TransferDropTargetListener[] {
            new CallHierarchyTransferDropAdapter(this, viewer)
        };
        viewer.addDropSupport(ops, transfers, new DelegatingDropAdapter(dropListeners));
    }
    private void addDragAdapters(StructuredViewer viewer, int ops, Transfer[] transfers) {
        TransferDragSourceListener[] dragListeners= new TransferDragSourceListener[] {
            new SelectionTransferDragAdapter(new SelectionProviderAdapter(viewer))
        };
        viewer.addDragSupport(ops, transfers, new JdtViewerDragAdapter(viewer, dragListeners));
    }   
            
    public void createPartControl(Composite parent) {
        fPagebook = new PageBook(parent, SWT.NONE);
        
        createHierarchyLocationSplitter(fPagebook);
        createCallHierarchyViewer(fHierarchyLocationSplitter);
        createLocationViewer(fHierarchyLocationSplitter);
        
        fNoHierarchyShownLabel = new Label(fPagebook, SWT.TOP + SWT.LEFT + SWT.WRAP);
        fNoHierarchyShownLabel.setText(CallHierarchyMessages.getString(
                "CallHierarchyViewPart.empty"));    
        showPage(PAGE_EMPTY);