public boolean isDirty() {
		BasicCommandStack commandStack = (BasicCommandStack) diagramEditor.getEditingDomain().getCommandStack();
		return savedCommand != commandStack.getUndoCommand();
	}

public class OpenPropertyViewFeature extends AbstractCustomFeature
    {

    public OpenPropertyViewFeature (IFeatureProvider fp)
        {
        super(fp);
        }

    @Override
    public boolean canExecute(ICustomContext context)
        {
        return true;
        }

    @Override
    public void execute(ICustomContext context)
        {
        try
            {
  PlatformUI.getWorkbench().getActiveWorkbenchWindow()
                    .getActivePage().showView("org.eclipse.ui.views.PropertySheet"); 
        catch (PartInitException e)
            {
  
            }
        }


    @Override
    public boolean hasDoneChanges()
        {
        return false;
        }

    @Override
    public boolean canUndo(IContext context)
        {
        return false;
        }