UXTableHeader

UXTableHeader is the column-title strip pinned above a UXTableView’s rows. It draws each title at its column’s x over a darker band that reads as chrome, with a rule beneath. It draws where the toolkit paints the table itself (GEM, headless). The native realizations use their own header and hide this subtree. It reads the same column data as the rows, so the header and rows always agree on where a column starts.