--- a
+++ b/man/whichInGrob.Rd
@@ -0,0 +1,30 @@
+\name{whichInGrob}
+\alias{whichInGrob}
+\title{
+Return indices of layers of interest from the grob object
+}
+\description{
+The function matches the supplied vector of grob's layer names to the grob object and returns the indices of those layer names.
+}
+\usage{
+whichInGrob(grob, layer)
+}
+\arguments{
+  \item{grob}{grob}
+  \item{layer}{character vector}
+}
+\details{
+If the layer doesn't exist the function returns NA.
+}
+\value{
+numeric vector
+}
+\author{
+Małgorzata Oleś <dr.malgorzata.oles@gmail.com>
+}
+\examples{
+library("ggplot2")
+gg = ggplotGrob(qplot(1,1))
+whichInGrob(gg, "xlab-b")
+whichInGrob(gg, c("xlab-b","panel"))
+}