Map drill down by Zoom

Hi everyone 

I have a bubble drill down map whihch the hierarch is CONTINENT-COUNTRY-CITY-POSTCODE, now i click in the drill down button in order to go to the next level. 

Is there a possibility to drill down automatically by zoom ? 

So when i zoom in Europe to go dynamically to the next level which is COUNTRY and see the countries and then when i zoom to a COUNTRY to see the Cities etc. 

I need to work in both ways zoom in and zoom out. 

Thanks in advance.