I have a grid that uses ColumnGroups and CommonColumnHeaders. The first of these groups only has a single column, each subsequent group has multiple columns. The first column in the grid is frozen. The issue is that when I scroll the grid horizontally, the CommonColumnHeader for the first non-frozen column group is shrinking to fit in the remaining space instead of being hidden behind the frozen column (see attached image describing issue). Any thoughts on why this would be happening?