Matlab - al pulsar un boton de GUI se abre otra vez la misma GUI

function varargout = graficas_axes(varargin)

gui_Singleton = 1;

gui_State = struct('gui_Name',       mfilename, ...

                   'gui_Singleton',  gui_Singleton, ...

                   'gui_OpeningFcn', @graficas_axes_OpeningFcn, ...

                   'gui_OutputFcn',  @graficas_axes_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 graficas_axes_OpeningFcn(hObject, eventdata, handles, varargin)

handles.output = hObject;

guidata(hObject, handles);

function varargout = graficas_axes_OutputFcn(hObject, eventdata, handles)

varargout{1} = handles.output;

function pushbutton1_Callback(hObject, eventdata, handles)

axes(handles.axes1)

fplot('sin(x)',[-pi pi])

function pushbutton2_Callback(hObject, eventdata, handles)

axes(handles.axes2)

fplot('cos(x)',[-2*pi 2*pi]