Bug 38155 Create dialog for Add Unimplemented Constructors action
Create a dialog so that the add unimplemented constructors action behaves more like the rest of the source/action dialogs.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/actions/AddUnimplementedConstructorsAction.java
/* (non-Javadoc)
	 * Method declared on SelectionDispatchAction
	 */
	public void selectionChanged(IStructuredSelection selection) {
		boolean enabled= false;
		try {
			enabled= getSelectedType(selection) != null;
		} catch (JavaModelException e) {
			
			if (JavaModelUtil.filterNotPresentException(e))
				JavaPlugin.log(e);			
		}
		setEnabled(enabled);
	}
	/* (non-Javadoc)
	 * Method declared on SelectionDispatchAction
	 */
	public void run(IStructuredSelection selection) {
		Shell shell= getShell();
		try {
			IType type= getSelectedType(selection);
			if (type == null) {
				return;
			}		
			
			IEditorPart editor= EditorUtility.openInEditor(type);
			type= (IType)EditorUtility.getWorkingCopy(type);