Hi Peter
Try this for Xbmc Eden and above. Just Copy and Paste into the Command Editor, if you don't already have it.
<?xml version="1.0" encoding="utf-16"?>
<command id="309" name="Activate Window {1}" enabled="true" alwaysOn="False" confirm="False" requiredConfidence="0" loop="False" loopDelay="0" loopMax="0" description="">
<action>
<cmdType>XJson.Raw</cmdType>
<cmdString>GUI.ActivateWindow&&"window": "{1}"</cmdString>
<cmdRepeat>1</cmdRepeat>
</action>
<phrase>activate window</phrase>
<payloadList> home, programs, pictures, filemanager, files, settings, music, video, videos, tv, pvr, pvrguideinfo, pvrrecordinginfo, pvrtimersetting, pvrgroupmanager, pvrchannelmanager, pvrguidesearch, pvrchannelscan, pvrupdateprogress, pvrosdchannels, pvrosdguide, pvrosd</payloadList>
</command>