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When I set the initial column width to 0, I can't subsequently resize the column in code. If I set it to 0.01, I can. The attached app demonstrates the problem in a quick and dirty way. Note that in the real app, the columns are created manually and their width is set to values stored as a user preference. A width of 0 is used to hide columns. If this is a bug, it is a low priority for me as I have a workaround.