I have figured out a way to solve this issue, I am posting an answer so that it might be helpful to someone.
In my custom modules config.xml file I have added
here manage_blog_edit_tabs point towards the class file which is responsible for adding tabs (in my case AW_Blog_Block_Manage_Blog_Edit_Tabs class) . I have override the
_beforeToHtml() method of that class to add new menu item.
class Netbiz_Post_Block_Adminhtml_Tabs extends AW_Blog_Block_Manage_Blog_Edit_Tabs
protected function _beforeToHtml()
'label' => Mage::helper('blog')->__('Regions'),
'title' => Mage::helper('blog')->__('Regions'),
'content' => $this->getLayout()
This adds the new menu for me.
Hope this helps someone.