help me doing this please

how to do like in the picture that i've already square it. i dont have any idea. anybody can help me ? tq.

[Stephen23]

You need a uicontrol listbox.

[Jan]

What is your question? Do you want to add a white square automatically in an image file? Or do you want to create a GUI with such a listbox field?

[fatin rasyidah]

i want create a GUI with a listbox field. can u help me ?