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This example shows a scrollable frame (from the BWidget package). This is useful if you have an unknown number of entry widgets on a dialog and you don’t know whether they will fit in a normal-sized dialog.
The BWidget package is not included in the minimal installation of Tcl/Tk which comes with R. You will have to install it separately.
The R code above produces a window with an area that can be scrolled up and down and that contains the 20 entries.