ComboBox is a GUI control which can be used to pick an item from a list. Its advantage is that it occupies less space on the form than a ListView-like control. ComboBox normally displays only one item from the list - the one that is currently selected. If the user wishes to change the selected item, ComboBox expands itself and shows all the items giving the user an opportunity to select another item. As soon as the new item is selected, ComboBox collapses into its original dimensions.

public class RoundComboBox : UserControl

Public Class RoundComboBox _
	Inherits UserControl

public ref class RoundComboBox : public UserControl