MATLAB: Loading items from listbox1 to listbox2

Question

I am having 2 listboxes. listbox 1 contains a list of files. I want to select multiple files from listbox1 and want to list them in listbox2. as i double click on any file on listbox1 it should get listed in listbox2.

My problem is..

when i double click a item in listbox1, it gets listed in listbox2. but when i double click the second item in listbox1, in listbox2, it comes in place of the previous item, not as the second item in the list.

i want to list all the items in listbox2 when double clicked from listbox1.

here is what , i am trying

function listbox1_Callback(hObject, eventdata, handles)

get(handles.figure1,'SelectionType'); % If double click if strcmp(get(handles.figure1,'SelectionType'),'open') index_selected = get(handles.listbox1,'Value'); file_list = cellstr(get(handles.listbox1,'String')); % Item selected in list box filename = file_list{index_selected};

    set(handles.listbox2,'String',filename)

end

Thank you for suggestions..

Answer 1

Add this:

 temp = get(handles.listbox2,'String'); 
 temp{end+1} = filename;
 set(handles.listbox2,'String',temp)