This allows you to create and delete GUI components and to delete links.
Here is an example of what it looks like:
This allows you to select the entity that new GUI components will be created for using the New List and New Detail buttons.
This creates a new list GUI component for the entity selected in the Entity combo. The new GUI component is added to the centre of the grid canvas.
This creates a new detail GUI component for the entity selected in the Entity combo. The new GUI component is added to the centre of the grid canvas.
This deletes the currently selected GUI component or link.