You can expand TreeViewItem based on the DragOverExpandDelay Timespan property while dragging the item over the node.
TreeViewAdv represents a new time span property called DragOverExpandDelay, that is used to define how long the TreeViewItem needs to wait before it expands, while dragging over the item.
You can achieve the above using the following code example.
The following screenshot displays the delay applied for the TreeViewItem.
Figure 1: Delay applied for the TreeViewItem
|Article ID:||Published Date:||Last Revised Date:||Platform:||Control:||.NET Framework:||Product Version:|