<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<div class="moz-cite-prefix">Hi Gaston,<br>
<br>
AFAICT not on the GeoExt2 side. <br>
<br>
The example you mention always has at least one base layer
actoive, but I guess you mean at least one overlay is visible
right?<br>
<br>
If that is the case, check the events of OpenLayers.Layer objects
over at
<meta http-equiv="content-type" content="text/html;
charset=ISO-8859-1">
<a class="moz-txt-link-freetext" href="http://dev.openlayers.org/releases/OpenLayers-2.12/doc/apidocs/files/OpenLayers/Layer-js.html#OpenLayers.Layer.events">http://dev.openlayers.org/releases/OpenLayers-2.12/doc/apidocs/files/OpenLayers/Layer-js.html#OpenLayers.Layer.events</a>.<br>
<br>
Hope that helps. <br>
<br>
Regards,<br>
Marc <br>
<br>
<br>
On 27.12.2012 01:30, Gaston Lucero wrote:<br>
</div>
<blockquote
cite="mid:CAC7DT697AkPhxy4uCK3SyNHHXQpTOiNiuYnRMEi42_+1A-L6XQ@mail.gmail.com"
type="cite">
<div dir="ltr">Hi, in the example
<div><a moz-do-not-send="true"
href="http://geoext.github.com/geoext2/examples/tree/tree.html">http://geoext.github.com/geoext2/examples/tree/tree.html</a></div>
<div style="">The layers are not mutually exclusive since it
allows not have any selected layer.</div>
<div style="">Is there a way to always leave one layer selected?<br>
</div>
<div style="">Thanks</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
Users mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Users@geoext.org">Users@geoext.org</a>
<a class="moz-txt-link-freetext" href="http://www.geoext.org/cgi-bin/mailman/listinfo/users">http://www.geoext.org/cgi-bin/mailman/listinfo/users</a>
</pre>
</blockquote>
<br>
<br>
</body>
</html>