TIWDBAdvWebGrid HoverColor and Background.Gradient

When using a TIWDBAdvWebGrid with a nice Background by setting the Background.Gradient1 and Background.Gradient2 properties to nice colours, it seems I cannot use this in combination with the HoverColor property. The use of HoverColor will show that colour when the mouse is over a row, but the row color is reset to white (and not the gradient background) when the mouse is moved to another row.

 
In effect, with one sweep of the mouse, you can reset the complete background of the grid to white. The Gradient settings of Background seem to be ignored.
 
Is this me (again), or something else that I can do? I've not set any of the other Color properties, only Background and HoverColor.
 
Groetjes, Bob Swart