gui plotting on axes

Im trying to attach a plot to an axes in a gui. Ive tried the following with no luck

   function axes1_CreateFcn(hObject, eventdata, handles)
  % hObject    handle to axes1 (see GCBO)
  % eventdata  reserved - to be defined in a future version of MATLAB
  % handles    empty - handles not created until after all CreateFcns called 
    ax = handles.axes1;
    l=15;
    x=0:0.01:l*cosd(20);
    y=tand(20)*x;
    plot(x,y,'b')
    x=100:-0.01:70-l*cosd(theta);
    y=-tand(20)*x+tand(20)*70;
    hold on;
    plot(ax,x,y,'g')
    ylim([0 15])

Ive also tried

axes(handles.axes1)
l=15;
  x=0:0.01:l*cosd(20);
  y=tand(20)*x;
  plot(x,y,'b')
  x=100:-0.01:70-l*cosd(theta);
  y=-tand(20)*x+tand(20)*70;
  hold on;
  plot(x,y,'g')
  ylim([0 15])

[Kevin Chng]

why don't you assign the axes for first plot?

plot(ax,x,y,'b')