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reloading tabs

Both in IE and Mozilla if I change something in the html file loaded into a tabbar from xml, the changes don't take effect. I think that the tabs are loaded from the cache. Is it poosible to set the tabbar htmls not to be cached somehow?

function reloadTab() {
        tabbar.clearAll();
        tabbar.loadXML("xml/tabs.xml");
}

doesn't work at all.

The tabbar use random URL elements to prevent XML caching, so there must not be problems with XML loading, you can force it by
    tabbar.preventIECashing(true);

But if the problem occurs with HTML pages which loaded as content later - there is no any special API for such case ( in most cases native caching of HTML pages is correct behaviour )
You can try do next modification, which will force HTML page reloading

    In dhtmlxTabbar.js locate next strings

- this._glframe.src=this._hrefs[tab.idd];
- this._content[tab.idd].childNodes[0].src=this._hrefs[tab.idd];

and replace them with

- this._glframe.src=this._hrefs[tab.idd]+getUrlSymbol(this._hrefs[tab.idd])+(new Date()).valueOf();
- this._content[tab.idd].childNodes[0].src=this._hrefs[tab.idd]+getUrlSymbol(this._hrefs[tab.idd])+(new Date()).valueOf();;

as resutlt each time when content of iframe will loaded - random element will be added to url, so it always be
unique, and fetched from server instead of cache.