How to insert a legend in grid.hexagons from hexbin in R -

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how insert legend in example below? 

library("grid") library("hexbin")  set.seed(506) x <- rnorm(10000) y <- rnorm(10000) z <- rnorm(100) w <- rnorm(100)  xmin = min(x, z) xmax = max(x, z)  ymin = min(y, w) ymax = max(y, w)  df <- data.frame(x, y) bin <- hexbin(df, xbins=30, xbnds= c(xmin, xmax) , ybnds= c(ymin, ymax)) graphic <- hboxplot(bin, xbnds= c(xmin, xmax) , ybnds= c(ymin, ymax))  pushhexport(graphic)   grid.hexagons(bin, border = gray(.7))   grid.points(z, w, pch=20, gp=gpar(col="blue")) #z , w others data vectors plot points on de grid.hexagons. upviewport()

i tried grid.hexlegend not worked me, maybe did not done right.

i appreciate help.


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