Hi Jose, Jose manuel Hernando Cobeña wrote:

-hello, I need to create a list of Colors, and I like do this:

list_colors <- varGet vColors .... color_red <- checkBox p [text := "Red", checked := False, on command := do aux red list_colors ] .... where aux one_color list_colors = if (elem one_color list_colors) then do varSet vColors (delete one_color list_colors) else do varSet vColors (red:list_colors)

but the variable vColors no change and I can not create de list of colors.

You should pass the variable to the helper function -- not its value. ie. this should work better: ... colorRed <- checkBox p [text := "Red", on command := onRed red vColors] ... where onRed color vColors = vColors [value :~ \colors -> if (color `elem` colors) then .. else color:colors] I hope this helps, -- Daan. ps. It is better to send wxHaskell related questions to the wxhaskell-users@lists.sourceforge.net mailing list instead of the Haskell list.

Thanks

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