zk.afterLoad('zul.mesh', function() {
	var xMeshWidget = {};
	zk.override(zul.mesh.MeshWidget.prototype, xMeshWidget, {
		_fixHeaders : function(force) {
			if (this.head && this.ehead) {
				var empty = true,
					flex = false,
					hdsmin = (this._hflex == 'min') || this.isSizedByContent();
				for (var i = this.heads.length; i-- > 0;) {
					var header = this.heads[i],
						emptyHeader = true;
					for (var w = header.firstChild; w; w = w.nextSibling) {
						//B70-ZK-2559: when dynamic adding auxhead, there has already
						//been auxhead widget while dom element hasn't attached yet
						var childNode = this.ehdfaker.childNodes[i];
						if (hdsmin && !childNode && !childNode.style.width && !w._nhflex) { //workaround
							// B50-3357475: assume header hflex min if width/hflex unspecified
							w._hflex = 'min';
							w._nhflex = -65500; // min
							w._nhflexbak = true;
						}
						if (!flex && w._nhflex)
							flex = true;
						if (w.getLabel() || w.getImage() || w.nChildren) {
							emptyHeader = false;
							empty = false;
						}
					}
	
					if (header._visible) {
						//B70-ZK-2559: description as mentioned
						var n = header.$n();
						if (n)
							n.style.display = emptyHeader ? 'none' : ''; // Bug ZK-2348
					}
				}
				var old = this.ehead.style.display,
					tofix = force && flex && this.isRealVisible(); //Bug ZK-1647: no need to consider empty header for flex calculation
				this.ehead.style.display = empty ? 'none' : '';
				//onSize is not fired to empty header when loading page, so we have to simulate it here
				for (var w = this.head.firstChild; w; w = w.nextSibling) {
					if (tofix && w._nhflex)
						w.fixFlex_();
					if (w._nhflexbak) {
						delete w._hflex;
						delete w._nhflex;
						delete w._nhflexbak;
					}
				}
				return old != this.ehead.style.display;
			}
		}
	});//zk.override
});//zk.afterLoad