Handle to Matlab patch gets deleted automatically, how to create array of figure handles

Question

figure;

for i=1:num
    h{i} = fill(c{i}(:,1), c{i}(:,2), 'b');
end

axis([0 500 0 700]);
daspect([1 1 1]);
hold on;

c is just a cell of 2D arrays that store x,y of the vertices of the polygons. I am trying to plot multiple polygons and store handles to them so that i can modify the polygons later. But after h{1} stores the patch to the first polygon in second iteration i=2, h{1} gets deleted.

How can i store the various patches?