Example of static binding means early binding, when you drag and drop button. you can see the code which event to be called. this has determined before runtime.
If you want to implement dynamic biding, it means this has been decied on runtime, for eg., you may have two types such as premium customer and normal customer of events this may be invoked based on which customer logged in the system.

use cases are differ based on the scenario which you would like to impelment.