Hello, One of my students is building a visual environment for the package dprep developed by my research group at the University of Puerto Rico. The environment will be in the style of the Orange (specifically channels and tokens design) and Weka (specifically Knowledge flow environment) machine learning/data mining software. She is using only the tools provided by tcl/tk (active tcl). I wonder if somebody else has built such kind of environment for a R package, and which tools has used? Best, Edgar Acuna CASTLE group UPR-Mayaguez -- Open WebMail Project (http://openwebmail.org)