Я сделал некоторые исследования и, на мой взгляд, проблема может быть решена путем установки свойства высоты CSS height:auto !important;
на каждом xe:basicContainerNode
НО, если вы открываете/закрыть панель аккордеона то свойство высота будет перезаписан :(
XPage Источник:
<xe:accordion id="accordion1">
<xe:this.treeNodes>
<xe:basicContainerNode label="Container one">
<xe:this.children>
<xe:basicLeafNode submitValue="Container one, choice one" label="Choice one"></xe:basicLeafNode>
<xe:basicLeafNode submitValue="Container one, choice two" label="Choice two"></xe:basicLeafNode>
<xe:basicLeafNode submitValue="Container one, choice three" label="Choice three"></xe:basicLeafNode>
</xe:this.children>
</xe:basicContainerNode>
<xe:basicContainerNode label="Container two" style="height:auto !important;">
<xe:this.children>
<xe:basicLeafNode submitValue="Container two, choice one" label="Choice one"></xe:basicLeafNode>
<xe:basicLeafNode submitValue="Container two, choice two" label="Choice two"></xe:basicLeafNode>
<xe:basicLeafNode submitValue="Container two, choice three" label="Choice three"></xe:basicLeafNode>
<xe:basicLeafNode submitValue="Container two, choice one" label="Choice one"></xe:basicLeafNode>
<xe:basicLeafNode submitValue="Container two, choice two" label="Choice two"></xe:basicLeafNode>
<xe:basicLeafNode submitValue="Container two, choice three" label="Choice three"></xe:basicLeafNode>
<xe:basicLeafNode submitValue="Container two, choice one" label="Choice one"></xe:basicLeafNode>
<xe:basicLeafNode submitValue="Container two, choice two" label="Choice two"></xe:basicLeafNode>
<xe:basicLeafNode submitValue="Container two, choice three" label="Choice three"></xe:basicLeafNode>
</xe:this.children>
</xe:basicContainerNode>
<xe:basicContainerNode label="Container three">
<xe:this.children>
<xe:basicLeafNode submitValue="Container three, choice one" label="Choice one"></xe:basicLeafNode>
<xe:basicLeafNode submitValue="Container three, choice two" label="Choice two"></xe:basicLeafNode>
<xe:basicLeafNode submitValue="Container three, choice three" label="Choice three">
</xe:basicLeafNode>
</xe:this.children>
</xe:basicContainerNode>
</xe:this.treeNodes>
</xe:accordion>
Firebug Скриншоты:
После XPage загружен:
![enter image description here](https://i.stack.imgur.com/mJuRc.png)
После Pane Открыт/Закрыт:
![enter image description here](https://i.stack.imgur.com/jybYC.png)