mplot y axis bounds turns off tooltip

[xandriaw]

This mplot (morrisjs) works fine within rCharts

df<-data.frame(time=c(1,2,3,4,5,6), values = c(9.4, 9.3, 11, 12, 12.2, 13.1))
m1 <- mPlot(values ~ time,data = df,type = "Line" )

but when I set the Y axis max and min:
m1$set(ymax=14, ymin=8.5)
the hover/tooltip stops working

Do you know if I can get the hover back? I tried m1$set(hideHover="auto") as well as setting the tooltip manually with

m1$set(hoverCallback = "#! function(index, options, content){
  var row = options.data[index]
  return '<b>' + row.time + '</b>' + '<br/>' +
     'value: ' + row.values 
} !#")

but whenever the ymin and ymax are set these don't show up.

How can I set the axis bounds and also have a hover ability?

thanks and I love rCharts!!!