There is no radio button widget in v7, but you can add it using widget="radio" attribute.

First you create your own widget [like selection widget] then add python code: 'syllabus': fields.selection([('state','State'),('cbse','CBSE')],'Syllabus'), and add XML code: <field name="syllabus" widget="radio"/>

The radio widget is available in trunk branch.

In OpenERP the radiobutton function is simuleted by a selection field. If you need to choose only one value in between some values you can use selection, if you want select more values there are booleans fields. Why you need radiobutton?

There is no radio button widget in v7, only drop down widget for both selection and many2one fields. However, in v8, there will be a new radio button widget that can be used in view using widget="radio" attribute.

The new radio widget is available now in trunk branch but there is no estimated release date yet for v8. I think it will be somewhere in 2014.

You can see this link where you can use it to make a radio button widget in openerp.

http://stackoverflow.com/questions/22612080/openerp-view-change-look-of-selection-field-aka-radio-button

if you want the module for free, kindly send your email to me at (engmohamans@gmail.com) .