Hi

I am trying to highlight an ideogram at specific region, so here is my code

library(ggplot2)
library(ggbio)
library(GenomicRanges)    

plotIdeogram(genome = "hg19", subchr = "chr1",which = GRanges(seqnames = "chr1", IRanges(start = 1,end = 1e7)))

This plot the ideogram but doesn't highlight the provided Genomic Range. I tried to play with color and fill but it still fails to render. Any ideas ?