@Eeli-K Thanks for your suggestion and I will give a try.But I found a way to insert an item at the particular index by using repeaters and Object Model inside a layout, For more information can also refer below link:

https://stackoverflow.com/a/43225476/6336374

@Eeli-K Thanks for the suggestion it worked and also there is another approach "Component.CreateObject()" in which we can create and destroy objects dynamically.

Thanks! Good to know that this should work.

color: "transparent" works correctly for me in an ApplicationWindow on Linux.