Bug 38569 Override/Implement Methods dialog should expand first element in viewer.
The treeviewer in the Override/Implement dialog isn't automatically revelaing the first element in the list, but it should to be consistent with other dialogs.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/actions/AddDelegateMethodsAction.java
if (o == null)
					return;
				ArrayList methods = new ArrayList(o.length);
				for (int i = 0; i < o.length; i++) {
					if (o[i] instanceof Methods2Field)
						methods.add(o[i]);
				}
				IEditorPart part = EditorUtility.openInEditor(type);
				type = (IType) JavaModelUtil.toWorkingCopy(type);
				
				
				IRewriteTarget target= (IRewriteTarget) part.getAdapter(IRewriteTarget.class);
				IMethod[] createdMethods= null;
				try {
					if (target != null) {
						target.beginCompoundChange();
					}
					 
					IJavaElement elementPosition= dialog.getElementPosition();					
					CodeGenerationSettings settings = JavaPreferencesSettings.getCodeGenerationSettings();
					settings.createComments= dialog.getGenerateComment();										
					createdMethods= processResults(methods, type, elementPosition, settings);
				} finally {
					if (target != null) {
						target.endCompoundChange();
					}
				}
				
				if (createdMethods != null && createdMethods.length > 0) {
					type.getCompilationUnit().reconcile();