ASPxVerticalGrid allows you to anchor rows on its top edge. The fixed rows are allowed if vertical scrolling is enabled. This can be useful if you need a specific row (or rows) to remain onscreen, regardless of scrolling.
To freeze a row, set its VerticalGridRow.Fixed property to true.
When a user scrolls the grid, its specified fixed rows are fixed when the first row’s top edge reaches the top edge of the container that stores the vertical grid. By default, the grid does not take into account the columns’ header heights that may break your layout.
Use the SetFixedRowsTopOffset(offset) method to set the top offset from the container’s top edge to fixed rows when you scroll the page. In general, this property value should equal the columns header width.