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SfGantt - Define Grouping of Timeline Count Function in Top Tier

Hi,

I would like to be able to group the top tier of a gantt chart by quarters.  However, as per the following screenshot, I am not able to control the grouping of the count function.  eg. I'd like the function to group by year (ie. Period 1 = January), but it in the below sample with no data, it has arbitrarily chosen to start the series in December.  I wonder if we could get a GroupBy in the GanttTopTierSettings component where we could group based upon Date.Year, or is there another way that I could define the starting point of the Count function?

I note that we don't have the problem in the bottom tier as it is implicitly already grouped by the top tier.


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   public string? Formatter_Top(DateTime dateTime)
   {
           ganttTopTierViewMode = topTierSettings.Unit;
           if (ganttTopTierViewMode != null)
           {
               if (ganttTopTierViewMode == TimelineViewMode.Month && ganttTopTierCount == 3)
               {
                   return $"{dateTime.Year}-{GetQuarter(dateTime)}";
               }
           }
           return null;
   }


    public string GetQuarter(DateTime dateTime) {
        var month = dateTime.Month;
        if (month >= 1 && month <= 3) {
            return "Q1";
        } else if (month >= 4 && month <= 6) {
            return "Q2";
        } else if (month >= 7 && month <= 9) {
            return "Q3";
        } else {
            return "Q4";
        }
    }