Every time you add a new extension of the `api:LeftAndMain` class to the CMS, SilverStripe will automatically create a new menu-item for it, with a default title and icon.
We can easily change that behaviour by using the static `$menu_title` and `$menu_icon` statics to
provide a custom title and icon.
The most popular extension of LeftAndMain is the `api:ModelAdmin` class, so we'll use that for an example.
We'll take the `ProductAdmin` class used in the [ModelAdmin reference](../reference/modeladmin#setup).
First we'll need a custom icon. For this purpose SilverStripe uses 16x16 black-and-transparent PNG graphics.
In this case we'll place the icon in `mysite/images`, but you are free to use any location.