but comboBox still doesn't reload.
The code you posted in the comments shows that you are trying to reload the combobox's datasource. This will work if
comboBoxDataSource is of
kendo.data.DataSource type. What I woud suggest you is to use the model
$scope.comboBoxListOptions to control the UI:
There is no need to call refresh() method after dataSource.read().
Check this demo for more details: http://dojo.telerik.com/OfIFo
As a side note, do not use private variables like "_data". It is safer to use the API:
This recipe can be found in it's original form on Stack Over Flow.