aseprite/data/widgets/main_window.xml

<!-- Aseprite -->
<!-- Copyright (C) 2001-2015 by David Capello -->
<gui>
  <window id="main_window" noborders="true" desktop="true">
    <vbox noborders="true" expansive="true">
      <hbox noborders="true" id="menu_bar_placeholder" />
      <hbox noborders="true" id="tabs_placeholder" />
      <splitter id="color_bar_splitter"
                horizontal="true" expansive="true"
                by="pixel">
        <vbox noborders="true" id="color_bar_placeholder" />
        <vbox noborders="true" expansive="true">
          <vbox noborders="true" id="context_bar_placeholder" />
          <hbox noborders="true" expansive="true">
            <splitter id="timeline_splitter"
                      vertical="true" expansive="true"
                      by="percetage" position="100">
              <hbox noborders="true" id="workspace_placeholder" expansive="true" />
              <vbox noborders="true" id="timeline_placeholder" expansive="true" />
            </splitter>
            <vbox noborders="true" id="tool_bar_placeholder" />
          </hbox>
        </vbox>
      </splitter>
      <hbox noborders="true" id="status_bar_placeholder" />
    </vbox>
  </window>
</gui>