Gets or sets the column located under the test point.
A GridColumn object representing the column that contains the test point. null (Nothing in Visual Basic) if the test point is over a visual element (card, card caption, separator, etc.) which does not belong to any column.
Use the Column property to obtain the column whose element is under the test point. To determine the type of the particular visual element under the test point, read the CardHitInfo.HitTest property's value.