How To Get Widget Data In Post Method Of Form Submission?

I have widget called List builder, which i used to sort list of contacts. when i submit the form the, i should get these sorted list of contacts in my $_POST array.

I am getting the content from CGridview widget but not from the following widget:




'leftList'=>Contactlist::model()->findUsersByemail( ),



//'rightList'=>Contactlist::model()->findUsersByemail( ),





How to submit this widget data, so that i can access it from $_POST array?