how to sort correlation matrix

Dear all, I have correlation matrix rho. And I would like to sort it so that I can observe the high and low correlations. I also have the labelNames array that I use to plot my correlation matrix and need to sort it accordingly as well. Any suggestions?

[rho, pval] = corr(x, 'rows','pairwise');
 imagesc(rho);
 title(cat(2,'GPM:',num2str(unique(GPM(index_arr{i})))));
 colormap(jet)
 colorbar;
 labelNames = {'PressDrop','Diffbot','Difftop','p4','p1','Diff','Supply','Choke','psi1','NA', 'SPM','Temp'};
 set(gca,'XTickLabel',labelNames);   % gca gets the current axis
 set(gca,'YTickLabel',labelNames);   % gca gets the current axis

[Massimo Zanetti]

What kind of sorting makes sense for a matrix? You should explain it better.