adding webpart pages to custom content type

HI Everyone,

Here is my requirement.

Create a list and columns by coding and add content type to that list, after adding the content type i have to add webpart pages to that content type(edit,display,new).i created every thing but i am not able to add the webpart pages to the content type can any one suggest me how to complete that one either by using feature or event receiver.

thanks in advance 

Ramu