deleteRowButton.addListener(new DeletePropertyClickListener(this));
actionButtons.addComponent(deleteRowButton);
Button addRowButton = new Button("+");
addRowButton.setData(newItemId);
addRowButton.addListener(new AddPropertyClickListener(this));
actionButtons.addComponent(addRowButton);
newItem.getItemProperty(ID_PROPERTY_ACTIONS).setValue(actionButtons);
}