all columns hidden become visible in chrome

<zk>
	<grid>
		<columns>
			<column id="col1" width="200px" label="col-1"/>
			<column id="col2" width="200px" label="col-2"/>
		</columns>
		<rows>
			<row><label value="row 1-1"/><label value="row 1-2"/></row>
			<row><label value="row 2-1"/><label value="row 2-2"/></row>
			<row><label value="row 3-1"/><label value="row 3-2"/></row>
		</rows>
	</grid>
	<toolbarbutton mode="toggle" checked="true" onClick="col1.setVisible(!col1.visible)" label="toggle col-1"/>
	<toolbarbutton mode="toggle" checked="true" onClick="col2.setVisible(!col2.visible)" label="toggle col-2"/>
</zk>

	zk.afterLoad('zul.mesh', function() {
		var xMeshWidget = {};
		zk.override(zul.mesh.MeshWidget.prototype, xMeshWidget, {
			_afterCalcSize : function() {
				var result = xMeshWidget._afterCalcSize.apply(this, arguments);

				if(this._isAllWidths()) {
					var allHeadersHidden = true;
					for(var header = this.head.firstChild; header; header = header.nextSibling) {
						if(header.isVisible()) {
							allHeadersHidden = false;
							break;
						}
					}
					if(allHeadersHidden) {
						if (this.eheadtbl) { this.eheadtbl.style.width = '0px'; }
						if (this.ebodytbl) { this.ebodytbl.style.width = '0px'; }
						if (this.efoottbl) { this.efoottbl.style.width = '0px'; }
					}
				}
				return result;
			}
		});//zk.override
	});//zk.afterLoad