private function isDeletingFile( eZHTTPTool $http, eZContentObjectAttribute $contentObjectAttribute )
    {
        $isDeletingFile = false;
        if ( $http->hasPostVariable( 'CustomActionButton' ) )
        {
            $customActionArray = $http->postVariable( 'CustomActionButton' );
            $attributeID = $contentObjectAttribute->attribute( 'id' );
            if ( isset( $customActionArray[$attributeID . '_delete_binary'] ) )
            {
                $isDeletingFile = true;
            }
        }

        return $isDeletingFile;
    }