/indra/newview/skins/default/xui/en/floater_choose_group.xml

<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
<floater
 legacy_header_height="18"
 height="258"
 layout="topleft"
 name="groups"
 help_topic="groups"
 title="GROUPS"
 width="280">
    <text
     type="string"
     length="1"
     follows="left|top"
     height="16"
     layout="topleft"
     left="12"
     name="groupdesc"
     top="24"
     width="248">
        Choose a group:
    </text>
    <scroll_list
     height="160"
     layout="topleft"
     left_delta="0"
     name="group list"
     top_pad="8"
     width="248">
        <scroll_list.columns
         name="name"
         width="248" />
    </scroll_list>
    <button
     height="20"
     label="OK"
     label_selected="OK"
     layout="topleft"
     left_delta="0"
     name="OK"
     top_pad="8"
     width="80" />
    <button
     height="20"
     label="Cancel"
     label_selected="Cancel"
     layout="topleft"
     left_pad="8"
     name="Cancel"
     top_delta="0"
     width="80" />
</floater>