How to display a custom control over the worksheet cell

This example demonstrates how to use the SpreadsheetControl.GetCellBounds method to display the ComboBox control over a worksheet cell preventing end-users from entering a wrong value in a cell. Each time an end-user clicks a cell in a particular column, the ComboBox appears, allowing the user to select one of the predefined values.
For implementation details, refer to the How to: Display a Custom Control over the Worksheet Cell article.