Crazy to find out how to force the message lines of inside the "Problem Attached Code" wrapping when data in a treeview model becomes longer than the original/previous column size. Can prevent the column grows each time of model updates ???
What does "it doesn't run" mean? Your program doesn't start? It starts but crashes? (or even, it does run but just doesn't change anything?) :P Assuming a crash, what does your debugger tell you about it?
Anyway, as the documentation says, that alone would not suffice: "This property has no effect unless the wrap-width property is set." But presumably that's not the only problem to solve right now.