<script><![CDATA[
zk.afterLoad('zul.inp', function() {
    var old = {};
    zk.override(zul.inp.ComboWidget.prototype, old,{
        open: function (opts) {
            if (this._open) return;
            this._open = true;
            if (opts && opts.focus)
                this.focus();
    
            var pp = this.getPopupNode_(),
                inp = this.getInputNode();
            if (!pp) return;
    
            this.setFloating_(true, {node:pp});
            zWatch.fire('onFloatUp', this); //notify all
            var topZIndex = this.setTopmost();
    
            var ppofs = this.getPopupSize_(pp);
            pp.style.width = ppofs[0];
            pp.style.height = 'auto';
            pp.style.zIndex = topZIndex > 0 ? topZIndex : 1 ; //on-top of everything
    
            var pp2 = this.getPopupNode_(true);
            if (pp2) pp2.style.width = pp2.style.height = 'auto';
    
            pp.style.position = 'absolute'; //just in case
            pp.style.display = 'block';
    
            // throw out
            pp.style.visibility = 'hidden';
            pp.style.left = '-10000px';
    
            //FF: Bug 1486840
            //IE: Bug 1766244 (after specifying position:relative to grid/tree/listbox)
            //NOTE: since the parent/child relation is changed, new listitem
            //must be inserted into the popup (by use of uuid!child) rather
            //than invalidate!!
            var $pp = zk(pp);
            $pp.makeVParent();
            zWatch.fireDown('onVParent', this);
            
            // B50-ZK-859: need to carry out min size here
            if (this.presize_()) 
                ppofs = this.getPopupSize_(pp);
            
            // throw in
            pp.style.left = '';
            this._fixsz(ppofs);//fix size
            
            // given init position
            $pp.position(inp, 'after_start');   
            this._shallSyncPopupPosition = false;
            
            // B65-ZK-1588: bandbox popup should drop up 
            //   when the space between the bandbox and the bottom of browser is not enough  
            var top = jq(pp).offset().top + (zk.chrome ? 1 : 0), // chrome alignement issue: -1px margin-top
                realtop = zk.ie == 10 ? Math.round(top) : top,
                after = jq(inp).offset().top + zk(inp).offsetHeight(),
                realafter = zk.ie == 10 ? Math.round(after) : after;
            
            if (realtop < realafter) {
                $pp.position(inp, 'before_start');  
                this._shallSyncPopupPosition = true;
            }
            pp.style.display = 'none';
            pp.style.visibility = '';
            this.slideDown_(pp);
    
            //FF issue:
            //If both horz and vert scrollbar are visible:
            //a row might be hidden by the horz bar.
            if (zk.gecko) {
                var rows = pp2 ? pp2.rows: null;
                if (rows) {
                    var gap = pp.offsetHeight - pp.clientHeight;
                    if (gap > 10 && pp.offsetHeight < 150) { //scrollbar
                        var hgh = 0;
                        for (var j = rows.length; j--;)
                            hgh += rows[j].offsetHeight;
                        pp.style.height = (hgh + 20) + 'px';
                            //add the height of scrollbar (18 is an experimental number)
                    }
                }
            }
    
            if (!this._shadow)
                this._shadow = new zk.eff.Shadow(pp,
                    {left: -4, right: 4, top: -2, bottom: 3});
    
            if (opts && opts.sendOnOpen)
                this.fire('onOpen', {open:true, value: inp.value}, {rtags: {onOpen: 1}});
    
            //add extra CSS class for easy customize
            jq(pp).addClass(this.$s('open'));
        },
    });
});                   
    ]]>
    </script>