The ASPxComboBox and ASPxListBox editors allow their list data to be represented in several columns.
The multi-column mode is in effect only for editors that obtain their items from a data source.
An editor's column collection can be defined and customized through the Columns property.
Each column within this collection should be bound to a data source field via the FieldName property.
You can also define a column's header caption, width, visibility state and other settings via column properties.
For the ASPxComboBox control, all its advanced features, such as incremental filtering, and loading items on
demand via callbacks, are supported in multi-column mode. The selected item is represented within the ASPxComboBox
editor's edit box using a value whose format is based upon the TextFormatString property's setting.