Flexi

gistfile1.txt

<screen> <!-- not flex -->
  <container horiztonal> <!-- flex column
    <vbox></vbox> <!-- 100% height, some width -->
    <hbox> <!-- remaining width -->
      <container vertical> <!-- 100% width -->
        <!-- the items split the available height -->
        <box>
           <container horizontal> <!-- 100% width -->
             <!-- the items split the available width -->
             <box></box>
             <box></box>
             <box></box>
           </container>
        </box>
        <box></box>
        <box></box>
      </container>
    </hbox> <!-- remaining width -->
  </container>
</screen>