Hi Janesh,
I am afraid that I am not able to reproduce the issue of bar items not being shown when they are added after the deletion of all bar items that are already created.
I have attached a video file that shows what I could see at my end. Could you please provide a video file that shows the issue? This will help us to resolve the issue soon.
The bar items can be added to the parent bar item by just drag and drop. The attached video file shows the same.
Please have a look at it and let me know if you need any further assistance.
http://websamples.syncfusion.com/samples/Tools.Windows/f60186_1/Main.htmBest regards,
Golda