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To be able to select assignments from a hierarchy of resources when using GanttChartView component of Gantt Chart Hyper Library for HTML5/JavaScript® (or Gantt Chart Web Library for ASP .NET), you may use TreeGrid component from the separate product of DlhSoft Hyper Library. See this sample application.
If you need to customize the tree cell template of the DataTreeGrid control from Hierarchical Data Light Library or of the GanttChartDataGrid control from Gantt Chart Light Library you should be aware that they don't automatically merge the custom DataTemplates that you might specify as DataTreeGridColumn.CellTemplate and/or DataTreeGridColumn.CellEditTempl…