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Outer layout disappearing when sizes changed

I'm trying to create a layout-in-layout using the following script. What I want is a fixed header panel in (a), a fixed navigation panel in (b), and an embedded layout in (c).

<script>

    var lMaster = new dhtmlXLayoutObject(document.body, "3T");

    lMaster.cells("a").setHeight(150);
    lMaster.cells("a").fixSize(false,true);
    //lMaster.cells("b").setwidth(200);
    //lMaster.cells("b").fixSize(true,false);

    //lMaster.cells("a").HideHeader();
    //lMaster.cells("b").HideHeader();
    //lMaster.cells("c").HideHeader();

    var lPage = new dhtmlXLayoutObject(lMaster.cells("c"), "2B");

</script>

When any one of the comments is removed the inner layout disappears. I've fixed the height of the header in (a), but if I try to hide its header, or fix the width of (b), only the "lMaster" layout is shown.

What am I doing wrong?