https://docs.dhtmlx.com/gantt/api/method/gettasktop/
getTaskTop method | DHTMLX Gantt Docs
gets the top position of the task's DOM element in the timeline area
dhtmlx ganttmethoddocs
https://www.nuget.org/packages/FSW.dhtmlx.Gantt.Standard
NuGet Gallery | FSW.dhtmlx.Gantt.Standard 1.0.0.8
nuget gallerydhtmlx ganttfswstandard