List Boxes in Matlab GUI

I have some problem in my code while generating the output using list box

My two list boxes are each displaying a set of values that correspond to the x and y values of my data set.

 X and y values are string values like "red". "blue", "green".

when i select the data item in both the list boxes, it will be linked to the data set and search for the selected item from x and Y and display the Z value from the data set which is again a string...

[David Sanchez]

Are you trying something? It is difficult to help you with the information you give, could you ask your question in a question way?