Background colors are rendering in 3 layers: Layer 0: draw with RowBg0 color if set, otherwise draw with ColumnBg0 if set. Layer 1: draw with RowBg1 color if set, otherwise draw with ColumnBg1 if set. Layer 2: draw with CellBg color if set. The purpose of the two row/columns layers is to let you decide if a background color changes should override or blend with the existing color. When using UI::TableFlags::RowBg on the table, each row has the RowBg0 color automatically set for odd/even rows. If you set the color of RowBg0 target, your color will override the existing RowBg0 color. If you set the color of RowBg1 or ColumnBg1 target, your color will blend over the RowBg0 color.