Is it possible to open pop up window from one portlet, that contains some other portlet ?
<portlet:renderURL var="kategorijaSelectorURL" windowState="<%= LiferayWindowState.POP_UP.toString() %>">
<portlet:param name="mvcPath" value="/html/kategorija/view.jsp" />
<portlet:param name="struts_action" value="/html/kategorija/view.jsp" />
<portlet:param name="tabs1" value="kategorije" />
<portlet:param name="redirect" value="<%=redirect1 %>" />
</portlet:renderURL>