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\description{
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\description{
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  Add a grob to a gTree or a descendant of a gTree.
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  Add a grob to a gTree or a descendant of a gTree.
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}
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}
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\usage{
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\usage{
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grid.add(gPath, child, strict = FALSE, grep = FALSE,
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grid.add(gPath, child, strict = FALSE, grep = FALSE,
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         global = FALSE, allDevices = FALSE, redraw = TRUE)
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         global = FALSE, allDevices = FALSE, redraw = TRUE)
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addGrob(gTree, child, gPath = NULL, strict = FALSE, grep = FALSE,
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addGrob(gTree, child, gPath = NULL, strict = FALSE, grep = FALSE,
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        global = FALSE, warn = TRUE)
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        global = FALSE, warn = TRUE)
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setChildren(x, children)
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setChildren(x, children)
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  \item{redraw}{A logical value to indicate whether to redraw the grob. }
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  \item{redraw}{A logical value to indicate whether to redraw the grob. }
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}
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}
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\details{
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\details{
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  \code{addGrob} copies the specified grob and returns a modified
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  \code{addGrob} copies the specified grob and returns a modified
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  grob.
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  grob.
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  \code{grid.add} destructively modifies a grob on the display list.
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  \code{grid.add} destructively modifies a grob on the display list.
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  If \code{redraw}
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  If \code{redraw}
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  is \code{TRUE} it then redraws everything to reflect the change.
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  is \code{TRUE} it then redraws everything to reflect the change.
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  \code{setChildren} is a basic function for setting all children
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  \code{setChildren} is a basic function for setting all children
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  of a gTree at once (instead of repeated calls to \code{addGrob}).
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  of a gTree at once (instead of repeated calls to \code{addGrob}).
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}
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}
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\value{
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\value{
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  \code{addGrob} returns a grob object;  \code{grid.add} returns \code{NULL}.
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  \code{addGrob} returns a grob object;  \code{grid.add} returns \code{NULL}.