How can I call the properties of figure with more than 1 graph in it?

I have a figure that has more than 1 graphs in it. How can I change the lineStyle of each one?

Answer 1

[Azzi Abdelmalek]

t=0:0.1:10;
y1=sin(t)
y2=cos(t)
h=plot(t,y1,t,y2)
set(h(1),'linewidth',12)

% h(1) and h(2) are handles of plot 1 and plot 2

[Mohammad]

Thank you, but I'm not the one drawing the graphs, The user enters a .fig file...

[Azzi Abdelmalek]

You can get the handles h by

h=get(gca,'children')