Use the Gallery control to add a menu of options to the Ribbon.
NOTE:To add a button that performs an action in addition to opening a menu, use the Split Button control.
To add a gallery
Open the UI Designer.
From the Design View pane, from the Ribbon simulation, select the tab and group to which you want to add the control.
To select a group, click the group name. Create a new group, if needed.
From the Insert Controlspane, click Gallery.
From the Subitems Collection Editor dialog box, click Add, and then select Button.
Repeat the previous step to add as many buttons as you want to appear in the menu.
With a button selected in the list, set the action and other properties.
When you have finished adding and configuring buttons, click OK.
The Subitems Collection Editordialog box closes.
Specify the appearance of the gallery by doing one of the following:
Select Change settings, and then type the label, tooltip, and description you want.
-or-
Click Select Action, and then select an action from which to use the label, tooltip, and description.
Click OK.