Nothing
## Simplest example with a callback
w <- gwindow("Hello world example")
b <- gbutton("click me", cont = w)
addHandlerClicked(b, handler = function(h,...) {
gmessage("Hello world", parent=w)
})
## show off
gstatusbar("Powered by RApache and gWidgetsWWW", cont = w)
visible(w) <- TRUE
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