ListBox error - existent field

Hi I have a problem, I wanted to let the selected folder names DICOM file appears in the listbox. But Hals me an error:

??? References to non-existent field 'ListBox'.

Error in ==> load at 35
set (handles.ListBox, 'String', char (dfiles.name), 'value', 1);

Does anybody know how to do it? Thank you very much.

h1=figure;
ListBox=uicontrol('Units','Normalized','Position',[0.01 0.1 0.1 0.15],...
    'Style','List');

P=fileparts(mfilename('fullpath'));
nfolder=uigetdir(P,'cokoliv');
handles.dfolder=nfolder;

handles.dfolder=nfolder;

dfiles=dir(handles.dfolder);
dfiles=dfiles(3:end);

set(handles.ListBox,'String',char(dfiles.name),'value',1);
fname=get(handles.ListBox,'String');
fname=fname(get(handles.ListBox,'value'),:);
img=dicomread([dfolder '\' fname]);
imagesc(img);

Answer 1

[Sean de Wolski]

 handles = 

    dfolder: 'H:\Documents\MATLAB'

It does not have a field ListBox. You can either make listbox a field

handles.ListBox = uicontrol(...

Or call get/set directly with ListBox

get(ListBox,'...

[Adam]

Great, thank you. I missed that detail (handles) before uicontrol. Thank you very much.