how to Change Navigation from default form to Newly created form

Hi All,

I have Two main forms in my custom entity-

"MainForm1"(Default Main form) is read-only form,which is displayed while viewing the entity form from grid.

"MainForm2"(newly created form) is editable form,which should be displayed upon clicking NEW button from the Main Ribbon.

I would like to know if it possible to change the Navigation of "NEW" Button on Entity Main Ribbon to newly created Main Form(MainForm2).

Thanks in advance

keerthi