ListBox PaintHeaderBackground does not cover the full header cell

Status: Fixed
Fixed in: v26.6.5
Source discussion: https://forum.objo.dev/d/377-size-of-the-background-in-a-listbox-header
Last updated: 2026-06-21

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Public summary

ListBox.PaintHeaderBackground receives a graphics context sized to the inset header content presenter rather than the full DataGrid header cell. Code that fills 0, 0, g.Width, g.Height therefore colours only part of the header, leaving the padded/sort-icon area unpainted.

Expected behaviour: custom header background painting should cover the whole header cell for the column.