multiple lists binding to single combobox(drop down button)

Question

i have multiple list of type byte and i need to bind it to a single combobox. Am stuck in the binding part. I need applebytes and mangobytes to binded to same combobox. Any help as am new to c# and wpf

.cs code

 appleBytes = new List<byte>();
 mangoBytes = new List<byte>();

.xaml part:

 <ComboBox ItemsSource="{Binding }" Width="40" Height="30" HorizontalAlignment="Left"/>