Files to look at:

• DataProvider.cs (VB: DataProvider.vb)
• Default.aspx (VB: Default.aspx)
• Default.aspx.cs (VB: Default.aspx.vb)

How to implement cascaded combo box columns in ASPxGridView without using templates

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The example illustrates how to create an editable grid with cascaded combobox columns. The implementation of the example includes the handling of manual callbacks and providing items for appropriate arguments.
By default, the combobox column uses a datasource that displays all records to show a user Text values instead of record keys.