Type-ahead-Hierarchical-combo

A combobox with two level combotree in it.

###Demo

###How to filter second level items? I hardcode colon (:) to filter the child level elements. Lets take the following list as an example to load in this combobox.

- Cars
    - Audi
    - Mercedes
    - Ferrari
- Bikes
    - Ducati
    - Honda

To select "Ducati", you need to type in search like this "Bikes:Ducati".