I've made a little example shows Google Maps layer loads tiles even if this layer is not visible. It is can be observed against firebug. How I can prevent this behavior?<span id="result_box" class="short_text" lang="en"><span class="hps"><br>
<a href="http://gis-lab.info/share/DR/sandbox/geoext/google.html">http://gis-lab.info/share/DR/sandbox/geoext/google.html</a><br></span></span>