wpf dropdown parts code example
Example: combobox WPF
//adding combo box items WPF (XAML)
<ComboBox>
<ComboBoxItem>ComboBox Item #1</ComboBoxItem>
<ComboBoxItem IsSelected="True">ComboBox Item #2</ComboBoxItem>
<ComboBoxItem>ComboBox Item #3</ComboBoxItem>
</ComboBox>