source: Dev/trunk/src/client/dojox/layout/tests/_bottomPane.html

<div class="wrap">
        Bottom Pane Content:
        <button dojoType="dijit.form.Button">
                Setup Toggler
                <script type="dojo/method" data-dojo-event="onClick">
                        // only do this once:
                        this.setAttribute('disabled',true);
                        var pane = dijit.getEnclosingWidget(this.domNode.parentNode);
                        
                        dijit.registry
                                .filter(function(n){
                                        // there is probably an easier way to get all the Splitters
                                        return n.declaredClass == "dijit.layout._Splitter";
                                })
                                .forEach(function(n){
                                        // add some stuff to this instance:
                                        dojo.mixin(n,{
                                                // toggle additions:
                                                _hackSize:null,
                                                _hackShowing:true,
                                                /*_setHack:function(e){
                                                        this._hackShowing = true;
                                                },*/
                                                _tgl: function(e){
                                                        if(this._hackShowing){
                                                                this._hackSize = dojo.marginBox(this.child.domNode);
                                                                this.child.domNode.style.height = "1px";
                                                        }else{
                                                                this.child.domNode.style.height = this._hackSize.h + "px";
                                                        }
                                                        // toggle state, and call layout() on parent
                                                        this._hackShowing = !this._hackShowing;
                                                        dijit.getEnclosingWidget(this.domNode.parentNode).layout();
                                                }
                                        });
                                        // using it's internal connect method, setup the toggler
                                        n.connect(n.domNode,"ondblclick","_tgl");
                                        //n.connect(n,"_cleanupHandlers","_setHack");
                                });
                </script>
        </button>

        <button dojoType="dijit.form.Button">
                Minimize
                <script type="dojo/method" data-dojo-event="onClick">
                        // simplified version of above:
                        var pane = dijit.getEnclosingWidget(this.domNode.parentNode);
                        pane.domNode.style.height = "1px";
                        dijit.byId("bc").layout();
                </script>
        </button>

</div>