Does anyone know what would cause an active-x control to flash ?

Im using the xpSuite from CIA, The Company, Inc.
and one of the controls is the xpListview

When I change rows with the up or down arrow keys the whole control seems to flash each time, but it does not do this with mouse clicks ???

The vendor says that the control is completely user draw and not using the VB ListView

Is there something i can set in vfp to eliminate this flash ?

Thanks