Each such tray within a tray widget can be considered a "mini-&xcenter;" inside the tray widget. It has an "Add widget" menu, and you can drag objects on it.

These trays are very similar to those of the &warpcenter;. As opposed to the &warpcenter; though, there are no limits as to how many trays can be defined per tray widget, and you may add more than one tray widget to each &xcenter;.

• To switch between the trays that are currently defined, click onto the tray icon and select a tray from the menu that appears. Initially, only one tray will exist in the tray widget.

• To add a new tray, rename the current tray, or delete the current tray, right-click onto the tray icon (or an empty space in the tray) and select the respective menu item. Note that there must be at least one tray in the tray widget, so "delete" will be disabled if there is only one.

• To add a subwidget to the current tray, right-click onto the tray icon (or an empty space in the tray) and select a widget from the "Add widget" menu, just as you would with the main &xcenter; menu.

  Note that not all widgets can appear in a tray. Most notably, sizeable widgets cannot appear in a tray. In the "Add widget" menu, those widgets that are not trayable are automatically grayed out.

  As with the main &xcenter;, in order to create an object button widget, you will need to drag a Desktop object and drop it onto the tray.

• To remove a subwidget from the current tray, right-click onto the subwidget and select "Remove widget", as with regular widgets too.