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
fCurrPackage= root.getPackageFragment(packName);
			fSuperClassCompletionProcessor.setPackageFragment(fCurrPackage);
		} else {
			status.setError(""); 
		}
		return status;
	}
	/*
	 * Updates the 'default' label next to the package field.
	 */	
	private void updatePackageStatusLabel() {
		String packName= getPackageText();
		
		if (packName.length() == 0) {
			fPackageDialogField.setStatus(NewWizardMessages.getString("NewTypeWizardPage.default")); 
		} else {
			fPackageDialogField.setStatus(""); 
		}
	}
	
	/*
	 * Updates the enable state of buttons related to the enclosing type selection checkbox.
	 */
	private void updateEnableState() {
		boolean enclosing= isEnclosingTypeSelected();
		fPackageDialogField.setEnabled(fCanModifyPackage && !enclosing);
		fEnclosingTypeDialogField.setEnabled(fCanModifyEnclosingType && enclosing);
	}	
	/**
	 * Hook method that gets called when the enclosing type name has changed. The method