How to share variables in different callback function?

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In my code,xdata exists in 'pushbutton1_Callback' function
function pushbutton1_Callback(hObject, eventdata, handles)
handles.xdata = xdata;
guidata(hObject,handles);
Then the xdata exists in handles.However,when I use ‘pushbutton1_Callback’ function in function ‘pushbutton2_Callback’,the xdata somehow disappears.
function pushbutton2_Callback(hObject, eventdata, handles)
pushbutton1_Callback(hObject, eventdata, handles)
I want to know what's wrong with it.And how can I get the xdata in pushbutton2_Callback.Thanks!

Accepted Answer

TAB
TAB on 4 Mar 2013
Edited: TAB on 4 Mar 2013
function pushbutton1_Callback(hObject, eventdata, handles)
handles = guidata(hObject); % Get gui data
handles.xdata = xdata; % Add your data gui data
guidata(hObject,handles); % Update the gui data with new value
function pushbutton2_Callback(hObject, eventdata, handles)
handles = guidata(hObject); % Get gui data
my_xdata = handles.xdata ; % Get your variable
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