add
Append the ViewModelInstance to the end of the list.
Throws
if item is disposed.
Insert the ViewModelInstance at the specified index. The item currently at that index and all subsequent items will be shifted one position to the right.
Append the ViewModelInstance to the end of the list.
if item is disposed.
Insert the ViewModelInstance at the specified index. The item currently at that index and all subsequent items will be shifted one position to the right.