'All menu items are not displayed inside tieredmenu

All menu items are not displayed inside the TieredMenu in PrimeFaces. The list also appears above the CommandButton.

Following is the code:

<p:commandButton id="adminButton" value="admin"/>
<p:tieredMenu overlay="true" trigger="adminButton" my="left top" at="left bottom">
  <p:menuitem value="file" url=""/>
  <p:submenu label="Next">
    <p:menuitem value="edit" url=""/>
    <p:menuitem value="revert" url=""/>
  </p:submenu>
  <p:menuitem value="home" url=""/>
  <p:menuitem value="quit" url=""/>
  <p:menuitem value="quit1" url=""/>
  <p:menuitem value="quit2" url=""/>
  <p:menuitem value="quit3" url=""/>
  <p:menuitem value="quit4" url=""/>
  <p:menuitem value="quit5" url=""/>
  <p:menuitem value="quit6" url=""/>
  <p:menuitem value="quit7" url=""/>
  <p:menuitem value="quit8" url=""/>
  <p:menuitem value="quit9" url=""/>
  <p:menuitem value="quit10" url=""/>
</p:tieredMenu>

How to make all the menus visible and they have to visible below the CommandButton. Can anyone please help me on this?



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