Groups can include a dialog launcher control in the lower-right corner. This control typically opens settings or performs other tasks relevant to the group.
To add a dialog launcher
On the Appearancetab, click UI Designer.
Do one of the following:
Create a new group by clicking Group in the Insert Controls pane.
-or-
Select an existing group from the Design View by clicking the group name.
With the group selected, from the Settings pane, select Show dialog launcher buttonto enable the settings.
From the Settings pane, to set the action and other properties for the new dialog launcher that appears on the Ribbon, click Select Action.
Click OK.