I am not sure I understand your question correctly. The "rsMainHeader
" class is added automatically to the tr elements if vertical grouping direction is set (as I've shown in the screenshot in my previous reply). I see that you have already enabled vertical grouping for the TimelineView (by setting the TimelineView-GroupingDirection="Vertical"
property), so you have to do the same for the other views you are using, the DayView for example: DayView-GroupingDirection="Vertical". You don't need to add the class yourself, you just have to add the CSS rule.
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