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If the component width is greater than the total width of each columns then the component's width will be shared to each columns equally except first column where its minimum width will be set. The minimum width of the first column is 200px for normal layout and 250px for grouping bar layout.
So, if the first column's width is set in code-behind then need to maintain it alone in the above case. The remaining component's width should be shared equally to rest of the columns.