CollapsiblePanelExtender _doClose() not working

i am using CollapsiblePanelExtender  inside ContentPlaceHolderID. i copied code as in javascript as

  extenders[0] = $find("CollapsiblePanelExtender1");
 extenders[]. _doClose();

here i am unable to find _doclose() in javascript.

  _doclose() is not working for me.

any clue?
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just put,
set the behavior id of the collapsiblepanel control to "cpe".

make sure you are using the behaviour id of the collapsiblepanel inside $find.

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