How to Plot a Figure in a axis GUI?

i would like to plot d function in a GUI axis

function pushbutton1_Callback(hObject, eventdata, handles)
tic
[filename,filepath] = uigetfile({'*.inp*';'*.net*';'*.txt*'}, 'Search Input Network File');

fullname = [filepath filename];
start_toolkit;
d = epanet(fullname);
%d.plot(axes1);
%axes(handles.axes1)
%plot(d)
%h = axes1;  
%d.plot;
%axesHe = findobj('Tag', 'axes1');
%plot(axesHe,[1 2 3],[1 2 3])
%plot(d, axesHe);
%plot(axesHe);
%axes(findobj('Tag', 'axes1')); %At the 2nd place in your code where you use 'handles.axes1'
%axes(handles.axes1);
%guidata(hObject,d)
%h = axes1;  d.plot('axes', h, axes1)
%d.unload
%clear; close('all'); clc;

toc

[Rik]

Have a read here and here. It will greatly improve your chances of getting an answer.

Look here for more information about GUIs.