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

<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<floater
 legacy_header_height="18"
 bevel_style="in"
 layout="topleft"
 name="sys_well_window"
 help_topic="notification_chiclet"
 save_rect="true"
 title="NOTIFICATIONS"
 width="320"
 min_width="320"
 height="23"
 can_minimize="false"
 can_tear_off="false"
 can_resize="true"
 can_drag_on_left="false"
 can_dock="true"
 save_dock_state="true"
 save_visibility="true"
 single_instance="true"
>
    <string
     name="title_im_well_window">
        CONVERSATIONS
    </string>
    <string
     name="title_notification_well_window">
        NOTIFICATIONS
    </string>

    <flat_list_view
	    color="FloaterDefaultBackgroundColor"
	    follows="all"
	    layout="topleft"
	    name="notification_list"
	    left="1"
	    top="20"
	    height="0"
	    width="318"/>
</floater>