“Ribbon control elements” and “Toolbar control elements” items are added to the category drop-down of the command list pane of the CUI editor, which you can select to filter and add elements quickly.
Ribbon control elements filters Ribbon control elements, shown as below,
Toolbar control elements filters Toolbar control elements, shown as below,
Also, Layer State Gallery and LayerFilterComboControl elements are added under Ribbon control elements category.
Layer State Gallery: Allows users to add a layer state pull-down in the Ribbon, which can display the existing layer states and access layer states manager.
LayerFilterComboControl: Allows users to add a Layer Filter Combo Control pull-down in the Ribbon, which can access your filters directly from the ribbon and turn layers on/off and freeze/thaw them in logical groupings.