By default, when you set the ListBoxSelection mode it disables the dragging of columns. This is by design, since the selection of rows in the ListBoxMode does not allow other types of selections (like selecting columns to drag them).
There are a couple of solutions. When you only want to support the SelectionMode, you can use the technique in the link () to highlight the single row, not using the SelectionMode and still enabling the dragging of columns through the property setting.
When you want to support the other SelectionMode setting, then you can derive the Grid and override the OnMouseDown and OnMouseUp events. You can turn off these ListBoxSelections while you are working with moving columns.
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