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

<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
<multi_floater
 can_close="false"  
 can_minimize="true"
 can_resize="true"
 height="390"
 layout="topleft"
 name="floater_im_box"
 help_topic="floater_im_box"
 save_rect="true"
 save_visibility="true"
 single_instance="true"
 title="CONVERSATIONS"
 width="396">
    <tab_container
     follows="left|right|top|bottom"
     height="390"
     layout="topleft"
     left="1"
     name="im_box_tab_container"
     tab_position="bottom"
     tab_width="64"
     tab_max_width = "134"
     tab_height="16"
     use_custom_icon_ctrl="true"
     tab_icon_ctrl_pad="2"
     halign="left"
     use_ellipses="true"
     top="0"
     width="394">
      <first_tab
       tab_bottom_image_flash="Toolbar_Left_Flash"/>
      <middle_tab
       tab_bottom_image_flash="Toolbar_Middle_Flash"/>
      <last_tab
       tab_bottom_image_flash="Toolbar_Right_Flash"/>
    </tab_container>
    <icon
     color="DefaultShadowLight"
     enabled="false"
     follows="left|right|bottom"
     height="17"
     image_name="tabarea.tga"
     layout="bottomleft"
     left="1"
     name="im_box_tab_container_icon"
     bottom="10"
     width="394" />
</multi_floater>