MKMuneesh Kumar G Syncfusion Team December 13, 2018 10:53 AM UTC
Greetings from Syncfusion. We have analyzed the reported problem with your sample and we were able to reproduce the reported issue at our end. We would like to inform you that while TabControl loading, it loads all controls (placed in all tabs) available in it, even that is not in the view.
Same as GanttControl (in second Tab) gets loaded without initializing its inner element. So that we got NRE while loading the TabControl. To overcome this NRE issue, we have added null check before the inner element (GantttGrid) accessing in GanttControl loaded event. Please find the code snippet as below.