with link list.it will not loose menu style.
1. Go to your blogger and click "Design" on your
dashboard and click "Edit HTML".
2. Make sure "Expand Widget Templates"
Do Not Put check mark.
3. Find these code by using Ctrl+F <b:widget id='PageList .
4. You will find code similar to this
5. Replace this line by the following code<b:widget id='PageList1' locked='false' title='Pages' type='PageList'/>
<b:widget id='LinkList123' locked='false' title='Menu' type='LinkList'>
<b:includable id='main'>
<div class='widget-content'>
<ul>
<b:if cond='data:blog.url == data:blog.homepageUrl'>
<li class='selected'>
<a expr:href='data:blog.homepageUrl'>Home</a>
</li>
<b:else/>
<li><a expr:href='data:blog.homepageUrl'>Home</a></li>
</b:if>
<b:loop values='data:links' var='link'>
<b:if cond='data:blog.url == data:link.target'>
<li class='selected'>
<a expr:href='data:link.target'><data:link.name/></a>
</li>
<b:else/>
<li><a expr:href='data:link.target'><data:link.name/></a>
</li>
</b:if>
</b:loop>
</ul>
<b:include name='quickedit'/>
</div>
</b:includable>
</b:widget>
6. Now save it.You can add link manually.