magento 1.9 – The block does not appear when creating a custom type

I'm trying to nest a block in another block, but the child block does not show up when I set a custom block type.

If I put both blocks as page / html so the two blocks show well:



    
        
            
        
    

But when I declare my custom block type so that I can use the custom block methods, the block does not show up.



    
        
            
        
    

I created this file: app / code / local / Company / MobileMenu / Block / MobileMenuBlock.php who has this content:

<? php
class Company_MobileMenu_Block_MobileMenuBlock extends Mage_Core_Block_Template
{
public function getNestedMenu ()
{
return the nested menu goes here;
}
}

I save it in my config.xml file as follows:


    
        
            0.1.0
        
    
    
        
            
                Company_MobileMenu_Block
            
        
    
    
        
            
                Standard
                
                    Company_MobileMenu
                    mobilemenu
                
            
        
        
            
                
                    company_mobilemenu.xml
                
            
        
    

What do I do wrong with the custom block registration?