Hi Misonsan
Thank you for contacting Syncfusion Support.
From your update, we come to know that you want to update the ComboBoxAdv based on the opeartion done in Button, ComboBoxAdv and TextBox controls. In our sample, we have called the common method, which would invoked when any operation done in the above mentioned controls. Similarly, by using this method you can update the ComboBoxAdv.
The sample has been prepared for the same and please download it from the following location:
Sample:
http://www.syncfusion.com/downloads/support/forum/136098/ze/ComboBox-542844859
Regards
Vijayalakshmi V.R.