How to pass an argument in a CreateFnc in a GUI?

I want to pass an argument in a GUI's create function. The GUI opening function though is executed "after" the creating on the GUI. So, how do I pass an argument in a create function?

I want to create a drop down menu and the number of options is not constant, it depends on previous processing.

Answer 1

[Image Analyst]

You don't. You do stuff in the OutputFcn(), not the CreateFcn(). OutputFcn is executed after the OpeningFcn. You can use global, or setappdata/getappdata(), or other ways described in the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.28s.29.3F

[Zina]

Great, many thanks!

Although setappdata/getappdata should have worked as well, I simply created an empty drop-down menu and then updated the list using set in the OpeningFcn