[R] question about possibility with R - Tcl/tk library

Hi , i am using the R(1.8.1) tcl/tk library in order to build a graphical user interface to mathematic function and i would like to know if it is possible to retrieve the value of a tkentry to make a R vector for exemple with an entry containing 1,2,3,4,5 i want to make a vector which

[R] GUI checkbox linked to entry

Hi , i am using R 1.8 and tcltk library in order to make a GUI and i would like to know if it is possible to link a check box to one or more entry dynamically (and eventually other widgets) . ( in concrete terms : if the check box is ticked the entry is avaible for input and unavaible when not