combo                   Combobox to manipulate a variable by offering a
                        list of alternative expressions...
entry                   Text entry field to manipulate a string
                        variable...
knob                    Knob to manipulate a real valued variable...
print.twiddlerControl   Display information about a twiddler control...
shortenString           Shorten a string if it is longer than a
                        limit...
toggle                  Checkbox to manipulate a boolean valued
                        variable...
twiddle                 Interactive manipulation of R expressions...
twiddle_print           Print, then directly flush the output buffer...
unboundVariables        Find the unbound variables of an R
                        expression...
