A split button includes a functional button and a menu. Split buttons look like galleries except that they perform an action in addition to opening a menu. For an example of a split button, see the Screen Historycontrol — when clicked, the button opens an option pane and the menu shows a history of recorded screens.
To add a split button
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 Split Button.
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.
From the Settings pane, set the action and other properties for the new split button that appears on the Ribbon.