This combo box lets the user pick a color from a list of colors using a subclass of ListComboBox. The user can also enter arbitrary CSS color names or values. This demonstrates how to use a text box class (here, ColorSwatchTextBox) and a list item class (LabeledColorSwatch) to provide custom rendering and validation for both input and choices. The base ListComboBox class provides AutoComplete functionality, matching against the provided list of color choices.