Hello Friends,
Finally little bit started plugin devlopment,
Follow stockable,textinput Plugins.. you can understand plugins development.
you can adding any extra variable assign __construct method
$extraparams = array( 'pricelimit_title'=>array(0.0,'int'),'pricelimit_list'=>array(0.0,'bool'));
$this->setConfigParameterable('custom_params',$extraparams);
and same values assign in XML file
if any one know usage of modifyPrice( $product, $field,$param,$selected ) method can share me...
Thanks
Srikanth