This type of styling sometimes do not work properly..
<Style TargetType="syncfusion:GridCell" x:Key="nullCellStyle">
<Setter Property="Background" Value="{Binding RelativeSource={RelativeSource Self},
Converter = {StaticResource changebackground}}" />
</Style>
Full code in attachment (issue occurs when scrolling)
not always in same place..
Attachment:
SyncfusionTests_101290a3.zip