showing values in levelplot or image

I have used ltext in a panel function like in the code segment below:

print(levelplot(reslot ~ aisle + quad, reslot.df,
    col.regions=topo.colors(max(quad.POG$values)),
    panel=function(x, y, z, ...){
        panel.levelplot(x, y, z, ...)
        panel.abline(v=seq(1.5, by=1, length=length(aisleOrder)),
               h=seq(1.5, by=1, length=26), col='gray')
        ltext(x, y, z, col='red', font=1)
    },

I am trying to visualize a 2D matrix, with some auxiliary labels associated
with each rectangle in the chart. The image command and levelplot in the
lattice package map data to colors, but I couldn't find any option to
specify values I want to show. Is there an easy way to do this?

Thanks,
Ken

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