For instance lets assume there are 4 pages - 

1. Internal Notes
2. Sales & Purchases
3. Accounting
4. History

To hide "History" page, try using attrs in XML file as below:

<page string="History" attrs="{'invisible': [('customer','=',False)]}">
.
.
.
</page>

If you are trying to use a new module to make changes to the page then follow this method:

<xpath expr="//page[@string='History']" position="attributes">
           <attribute name="attrs">{'invisible': [('customer','=',False)]}</attribute>
</xpath>

Ok. I have no karma to comment the answer. So i just entering as answer. Same i want in another case. Here customer & supplier are two checbox. so we can easily add the attrs. But in my case, no checkboxs, only menu. then how can i hide?