GUI: Load/insert object in listbox for selected everyone

Hi, i have a GUI that when i push a pushbotton, the GUI load a few elements axsial-symmetric in .stl format and display that in a axes with the STL_Import functions. The question is: It's possible to display in a list (i presumed in a listbox) the objects insert whit the pushbotton for selected separately everyone of that? This because after i need to move this objects in the axes.. Thanks