C# Create message box for ComboBox : I can not see the full names of the data in the C # form application because I can not extend the width of the ComboBox due to the design of my screen.

Before I make a selection, I want to show it in the ComboBox as shown below. How do I do this in the combo box?
[enter image description here][1]


  [1]: https://i.stack.imgur.com/THivf.png