Hi Anthony Pieper,
Please find attached two sample projects that shows how to accomplish the desired functionality.
1.The first example is without a custom Style and AllowDropProperty is set in code.
this.listBox1.SetValue(RadDragAndDropManager.AllowDropProperty,true);
this.listBox2.SetValue(RadDragAndDropManager.AllowDropProperty,true);
2.The second one contains a custom Style for ListBox.
I hope that this will be helpful.
Sincerely yours,
Boryana
the Telerik team