MATLAB newbie - add element to pop-up menu - matlab

Question

i want to add element to my pop-up menu that user write it in a text field , i'm new to matlab so any explanation is very appreciated , i know it's about a callback in the pushbutton but i don't know how to do it exactly..
My gui so far :
my code so far :
function varargout = popupmenu(varargin)
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', #popupmenu_OpeningFcn, ...
'gui_OutputFcn', #popupmenu_OutputFcn, ...
'gui_LayoutFcn', [] , ...
'gui_Callback', []);
if nargin && ischar(varargin{1})
gui_State.gui_Callback = str2func(varargin{1});
end
if nargout
[varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
gui_mainfcn(gui_State, varargin{:});
end
function popupmenu_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;
guidata(hObject, handles);
function varargout = popupmenu_OutputFcn(hObject, eventdata, handles)
varargout{1} = handles.output;
function edit1_Callback(hObject, eventdata, handles)
function edit1_CreateFcn(hObject, eventdata, handles)
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
function popupmenu1_Callback(hObject, eventdata, handles)
function popupmenu1_CreateFcn(hObject, eventdata, handles)
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
function pushbutton1_Callback(hObject, eventdata, handles)

Answer 1

In the pushbutton1_Callbackyou might add:
new_item=get(handles.edit_1,'string') % to get the string from the edit box
tmp=get(handles.popupmenu1,'string') % to get the actual list of items in the popup menu
tmp{end+1}=new_item % to add the string
set(handles.popupmenu1,'string',tmp) % to update the popup menu items

Answer 2

i done it , in the callback button :
dropdownListStrings = {'item1',item2'}
handleToListbox = uicontrol('Style', 'popup','Position', [20 60 200 60], 'String', dropdownListStrings);
but how to get the new data from the new popup menu ??
EDIT :
found it
handleToListbox = uicontrol('Style', 'popup','Position', [20 60 200 60], 'String', dropdownListStrings,'Callback',#setmap);
function setmap(source,callbackdata)
val = source.Value
string = source.String(val)
end