Change X-axis with related data

I'm plotting a cluster using dendrogram functions where the axis is not represented sequentially. I want to change the numbers by other variables when I try to change using set(gca, 'XTickLabel',......) it's printing the data I'm providing by this function sequentially but it's wrong while the x-axis is not sequence cause of the cluster distance.

Any idea how to fix it

[dpb]

Not precisely w/o a more concrete example of what your data are and what you're trying to accomplish...