How clean data in <p:overlayPanel ... when is opening or cloasing - primefaces

Question

<p:overlayPanel appendToBody="true"
id="panel_l#{level.name.hashCode()}
f{filterTypeConfiguration.filterType.name.hashCode()}"
for="conrolForm_l#{level.name.hashCode()}f
#{filterTypeConfiguration.filterType.name.hashCode()}:
button_l#{level.name.hashCode()}f
#{filterTypeConfiguration.filterType.name.hashCode()}"
dynamic="true" >
...
and in overlayPanel I have:
<p:inputText value="#{filterTypeConfiguration.textToSearch}">
<p:ajax id="ajaxFilterSearch" event="keyup" update="overlayForm_l
#{level.name.hashCode()} f#{filterTypeConfiguration.filterType.name.hashCode()}
:select_l#{level.name.hashCode()}
f#{filterTypeConfiguration.filterType.name.hashCode()}"
</p:inputText>
I need clean data in inputText when overlayPanel is opening or closing.

Answer 1

I didn't use p:overlayPanel yet but I am able to trigger p:dialog diaglodReturn event like, I think it should be similar like this
<p:ajax event="dialogReturn" update="#form" listener="#{backing.refreshPage}" />
Or
Example from primefaces showcase, How about add action attribute for button?
<p:commandButton id="imageBtn" value="Basic" type="button" action="#{backing.refresh}" />
<p:overlayPanel id="imagePanel" for="imageBtn" hideEffect="fade">
<p:graphicImage name="/demo/images/nature/nature1.jpg" width="300" />
</p:overlayPanel>