I would like to know how can I make the the drop preview line be vertical.
I used ItemsPanel to make the tree items be horizontal, but when I set the "IsDragDropEnabled" property true, I found that the drop preview line is horizontal, as you know, it should be vertical. What I need to do?
Currently this cannot be achieved "out of the box". You can vote for this feature request in order to increase its priority. It will be renamed to TreeView: Support DragCue and vertical PreviewDropLine when TreeView renders its items horizontally in the next few hours. Thank you for your interest.
the Telerik team
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