[bsoriano]

Have you closed the window before? 

<onclick>close</onclick>
<onclick>activatebla</onclick>

Edit:
the gotopath action does exactly the same. It closes the dialog and then updates the myvideonav container or activates the new window.
So this should also work
<onclick>RunScript(script.embuary.helper,action=goto,path='"plugin://script.embuary.helper/?info=getseasonepisodes&dbid=$INFO[ListItem.DBID]&season=$INFO[ListItem.Season]&idtype=episode"',target=videos)</oncli

@sualfred, no, I did not close it before!  I will test this shortly.  Thanks

Regards,

Bart