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diff --git a/inst/GUI/simple.R b/inst/GUI/simple.R
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+# Work in progress - simple GUI for mkin
+w <- gwindow('Simple R GUI for kinetic evaluations', visible=FALSE) 
+# Project definition {{{
+pr <- gexpandgroup("Project", cont=w)
+
+n.observed <- 1
+max.n.observed <- 9
+observed.names = c("parent", paste("M", 1:(max.n.observed - 1), sep=""))
+
+prg <- ggroup(horizontal=FALSE, cont = pr)
+prl <- glayout(cont = prg)
+prl[1,1] <- glabel("Number of observed variables", cont=prl)
+prl[1,2] <- (n.observed.gw = gcombobox(
+  1:max.n.observed, 
+  handler = function(h, ...) {
+    n.observed <<- svalue(n.observed.gw)
+    filter.expression <- paste("^[1-", n.observed, "]$", sep="")
+    observed.gw$filter("Index", filter.expression)
+  },
+  cont=prl))
+
+observed.gw <- gdf(
+  items = data.frame(Index = 1:max.n.observed, 
+    Name = observed.names, stringsAsFactors=FALSE),
+  name = "Names of observed variables",
+  width = 500, height=250, cont=prg)
+
+addSpace(prg, 15)
+prf <- gfile("Project file in binary R format (preferably use .RData as extension)", 
+  container = prg)
+addSpring(prg)
+addSpace(prg, 15)
+pr.ok <- gbutton("save", 
+  handler=function(h,...) {
+      galert(svalue(prf), parent=w)
+    }, container=prg)
+
+gbutton("ok", handler = function(h, ...) {
+  observed <- observed.gw[1:n.observed,2]
+  save(observed, file="observed.RData")
+  visible(pr) <- FALSE
+  },
+  cont=prg
+)
+
+visible(pr) <- TRUE
+# }}}
+
+# Dataset definition
+ds <- gexpandgroup("Datasets", cont=w)
+s <- gdf(data.frame( Author = c("Meier"), Year = "3", Title = "4"),
+  name = "Studies",
+cont=ds)
+
+size(s) <- c(800,200)
+visible(ds) <- TRUE
+
+# Model definition
+ms <- gexpandgroup("Models", cont=w)
+visible(ms) <- FALSE
+
+# Evaluation window
+mw <- gframe("Evaluations", cont=w)
+
+# Status bar
+gstatusbar("Powered by gWidgetsWWW", cont = w)
+visible(w) <- TRUE 
+# vim: set foldmethod=marker: