Moving a structure into a gui

I'm trying to get questions(1).text into a static text box in a gui. After clicking on he push button the structure appears in the command window, but I can't get it to appear in the static text box. The static text box is tagged Text_1, but I keep getting an error saying that Text_1 is undefined.

function ptn1_Callback(hObject, eventdata, handles)
handles.questions(1).text = 'Amino acids are all composed of an amine group, a carboxyl group, a hydrogren, and an R group. Which group determines the chemical reactivity and solubility of the amino acid? ';

handles.questions(1).rightanswer = 'The R group';

handles.questions(1).wronganswer1 = 'The hydrogden';

handles.questions(1).wronganswer2 = 'The amine group';

handles.questions().wronganswer3 = 'The carboxyl group';

x = randi(1);
handles.questions(randi(x))

set(handles.Text_1,'String',handles.questions(randi(x)).text)

This is the error message.

Reference to non-existent field 'Text_1'.

Error in Hopeful_game>ptn1_Callback (line 97)
set(handles.Text_1,'String',handles.questions(randi(x)).text)

Error in gui_mainfcn (line 96)
        feval(varargin{:});

Error in Hopeful_game (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in @(hObject,eventdata)Hopeful_game('ptn1_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating uicontrol Callback

Answer 1

[Walter Roberson]

If you create the field handles.Text_1 dynamically, then before the end of the function you create it in, you need to

guidata(gcf, handles);