order of tile in heatmap

[bmyury]

I couldn't find anywhere how to extract the order of cells in the expression heatmap. Is it built based on the model$milestone_percentages? In many cases the milestone percentages are identical (e.g. 0). It is not clear in such case how the order is determined (is it alphabetical, based on cell_id?) or which command to use to extract the exact order of cells in the heatmap. Please assist