Bug 52064 Content assist in "New Class" Dialog shows interfaces
Content Assist is available for the superclass in M7. However it also lists interfaces. If an interface is selected, the generated class "extends" it instead of "implementing" it.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/wizards/NewTypeWizardPage.java
gd= new GridData(GridData.HORIZONTAL_ALIGN_FILL);
		gd.heightHint = SWTUtil.getButtonHeightHint(button);
		gd.widthHint = SWTUtil.getButtonWidthHint(button);
		button.setLayoutData(gd);
		ControlContentAssistHelper.createTextContentAssistant(text, fEnclosingTypeCompletionProcessor);
	}	
	/**
	 * Creates the controls for the type name field. Expects a <code>GridLayout</code> with at 
	 * least 2 columns.
	 * 
	 * @param composite the parent composite
	 * @param nColumns number of columns to span
	 */		
	protected void createTypeNameControls(Composite composite, int nColumns) {
		fTypeNameDialogField.doFillIntoGrid(composite, nColumns - 1);
		DialogField.createEmptySpace(composite);
		
		LayoutUtil.setWidthHint(fTypeNameDialogField.getTextControl(null), getMaxFieldWidth());
	}
	/**
	 * Creates the controls for the modifiers radio/checkbox buttons. Expects a 
	 * <code>GridLayout</code> with at least 3 columns.
	 * 
	 * @param composite the parent composite
	 * @param nColumns number of columns to span
	 */		
	protected void createModifierControls(Composite composite, int nColumns) {
		LayoutUtil.setHorizontalSpan(fAccMdfButtons.getLabelControl(composite), 1);
		
		Control control= fAccMdfButtons.getSelectionButtonsGroup(composite);