>How can i add property to a Custom Visual Class that supports array bahavior.
>
>for example, if i add a property Columna, i want to be able to make of this property an array, so in code i will say:
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>this.Columna(1).Value = 0

You're talking about collections here. Otherwise, just use thisform.Columna[1]=0
thisform.Columna[2]=1
etc.