You need to set the DataItemUpdateTrigger to OnCellValueChange.
Default value for all fields in a XamDataGrid
<igDP:XamDataGrid.FieldSettings>
<igDP:FieldSettings
DataItemUpdateTrigger="OnCellValueChange" />
</igDP:XamDataGrid.FieldSettings>
- I believe this could easily be applied as a style for all XamDataGrids.
For an individual Field
<igDP:Field Label="" Name="IsSelected" >
<igDP:Field.Settings>
<igDP:FieldSettings DataItemUpdateTrigger="OnCellValueChange" />
</igDP:Field.Settings>
</igDP:Field>