Nothing
w <- gwindow("gbutton", visible=FALSE)
g <- ggroup(horizontal = FALSE, cont = w)
b <- gbutton("button", cont = g)
# svalue
print(svalue(b))
#svalue<-
svalue(b) <- "new button text"
## addHandlerChanged (click)
addHandlerChanged(b, function(h,...) print("hi"))
# button with icon
b1 <- gbutton("quit", cont = g)
# action button
a <- gaction("action", icon = "quit", handler = function(h,...) print("action"))
gbutton(action=a, cont = g)
visible(w) <- TRUE
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