Force update of wms.Source (request new image from WMS)

[apdevelop]

There are some cases when map view should be updated without user action (for example when object was deleted on server and client needs to refresh map view automatically).
My simple solution is adding forceUpdate() function to wms.Source class, which adds dummy timestamp parameter to list of WMS parameters, updates overlay and than removes parameter:

'forceUpdate': function () {
    if (this._overlay) {
        this._overlay.setParams({ '_t': ((new Date()).getTime()) });
        delete this._overlay.wmsParams['_t'];
    }
},

Is there any simpler and cleaner solution?