In order to have a customized control in a grid cell, a custom cell model and cell renderer are needed. There are built-in model/renderers inside the source library. These model/renderer can be used as base classes for those customized model/renderer. Here, the customizing control is a dropdown control. So the custom classes can be derived from GridDropDownCellModel and GridDropDownCellRenderer built-in classes.
ColorUIGroups tab name can be changed in the InitializeDropDownContainer method.
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