Re: Need help to select some listbox item in different listbox together

> May I ask the sample code to use colouring to emulate row selection ?
> I still new in Ruby.

You'll need to find a colour which suits your interface (I've just kept 
green from my line of code); and I didn't actually use the selection 
event of the listbox so you'd need to trap that first, but this code 
will colour an item:

@ListBox1.itemconfigure(1, :background => "green")

"1" will be the index of whichever item you had selected. What you'd 
then need to do is send the same index value to your other columns:

@ListBox2.itemconfigure(list_1_items.index(1), :background => "green")
@ListBox3.itemconfigure(list_1_items.index(1), :background => "green")

Or like this:

idx = 1

[@ListBox1, @ListBox2, @ListBox3].each do |current_object|
current_object.itemconfigure(idx), :background => "green")
end

Another trick is if you know the value of the cell selected in the first 
column (first listbox), and if you have the array which corresponds to 
that list. What you can do is retrieve the index from the array of 
values.
So say values_array is ["red","blue","yellow"], and you wanted to find 
"blue", the code would be:

["red","blue","yellow"].index("blue")
=>1

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