[R] tcl('tk::fontchooser', 'show') : How to use? R-devel Tcl 8.6

Hello, Somebody would indicate the correct way to use the option the fontchooser widget into tcltk package (in R-devel, Tcl 8.6) ? I tried to use as other traditional widgets but no success. (code below) Thanks Cleber > tt <- tktoplevel(); but <- ttkbutton( tt, text='Test'); tcl('pack', but )

[R] tcl('tk::fontchooser', 'show') : How to use? R-devel Tcl 8.6

Hello, Somebody would indicate the correct way to use the option the fontchooser widget into tcltk package (in R-devel, Tcl 8.6) ? I tried to use as other traditional widgets but no success. (code below) Thanks Cleber > tt <- tktoplevel(); but <- ttkbutton( tt, text='Test'); tcl('pack', but )