Use the Button control to add a button that performs a single task or action.
To add a 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 Controls pane, click Button.
From the Settings pane, set the action and other properties for the new button that appears on the Ribbon.