position - Positioning the OverlayPanel of PrimeFaces -

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can give me key/values fix overlaypanel position? want fix in middle, can't figure out. have example:

<p:overlaypanel id="overlaypanelsearch" for="searchbutton" my="top" at="bottom">

this how understand it.
"my" overlay panel box.
"at" commandbutton. 

<p:commandbutton id="chartbtn" type="button" />   <p:overlaypanel id="chartpanel" for="chartbtn" my="right top" at="right bottom">     ... </p:overlaypanel>

so above reads: "connect right top of overlay panel right bottom of command button"


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