Bug 6754 Hierarchy does not show selection on F4
Build 20011206 - opened hierarchy on org.eclipse.jface.dialogs.MessageDialog - selected Dialog superclass and hit F4 - the resulting hierarchy was scrolled to the end, with the selection (Dialog) not visible
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/typehierarchy/TypeHierarchyViewPart.java
*/		
	public int getViewIndex() {
		return fCurrentViewerIndex;
	}
	
	private TypeHierarchyViewer getCurrentViewer() {
		return fAllViewers[fCurrentViewerIndex];
	}
	/**
	 * called from EnableMemberFilterAction.
	 * Must be called after creation of the viewpart.
	 */	
	public void enableMemberFilter(boolean on) {
		if (on != fIsEnableMemberFilter) {
			fIsEnableMemberFilter= on;
			if (!on) {
				IType methodViewerInput= (IType) fMethodsViewer.getInput();
				setMemberFilter(null);
			
				if (methodViewerInput != null && getCurrentViewer().isElementShown(methodViewerInput)) {
					
					internalSelectType(methodViewerInput);
				} else if (fSelectedType != null) {
					
					internalSelectType(fSelectedType);
					updateMethodViewer(fSelectedType);
				}
			} else {
				methodSelectionChanged(fMethodsViewer.getSelection());
			}