How to add a filter results button to search items on click rather than automatically - ASPxComboBox DevExpress

ASPxComboBox clear selection on delete or backspace

If you are using a DevExpress ASPxComobobox and you want to be able to unselect an item you can use the below code:

Devexpress combobox datasource lost after postback

If you are using devexpress comboboxs and the datasource is null after postback. this may be becuase the combobox is set up to use multiple columns. If this is the case then multi column comboboxes need to be rebound on each postback to ensure the items still exist.

How to populate DevExpress GridView combobox header filter

You need to subscribe to the AutoFilterCellEditorInitialize event. Check the column name, and cast the control to set the datasource.