function WriteText(x,y,txtline,color)
% WriteText: with back color Can be specified in Matlab 6.5)
% 
% Write the text to get the size
ht = text(x,y,txtline,'VerticalAlignment','top');
pos = get(ht,'Extent');
xp =[ pos(1) pos(1)+pos(3) pos(1)+pos(3) pos(1)];
yp =[ pos(2) pos(2) pos(2)+pos(4) pos(2)+pos(4)];
patch(xp,yp,color,'EdgeColor',[1 1 1])
ht = text(x,y,txtline,'VerticalAlignment','top');