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Gets the collection of RenderInputComboBoxItem objects representing the items in the combobox dropdown.
[C1TypeSerialization(C1TypeSerializationEnum.Content)]
public RenderInputComboBoxItemCollection Items { get; }
This method always returns a non-null RenderInputComboBoxItemCollection, initializing it if it did not exist. To test whether a combobox already contains items without creating the Items collection, use the HasItems property.