<?page title="Preumowa" contentType="text/html;charset=UTF-8"?>

<zk>
<window id="mainWindow" border="normal" apply="org.zkoss.bind.BindComposer">
<button label="works" upload="true,maxsize=50000, multiple=true, native" onUpload="@command('addDocument',typDokumentu='PU')"/>
<tabbox>
<tabs>
<tab label="tab2"/>
<tab label="tab2"/>
</tabs>
<tabpanels>
<tabpanel>
<button label="works" upload="true,maxsize=50000, multiple=true, native" onUpload="@command('addDocument',typDokumentu='PU')"/>
</tabpanel>

<tabpanel>
<button label="doesn't work" upload="true,maxsize=50000, multiple=true, native" onUpload="@command('addDocument',typDokumentu='PU')"/>
</tabpanel>
</tabpanels>
</tabbox>
</window>
</zk>