Infragistics UltraGrid summary updating when grid not visible

i'm having some issues with Ultragrid, here is the situation: (developing c# win-form) my main form have scrollable tablelayoutpanel, with several UserControls, added dynamically. each UserControl contains UltraGrid. the user can change things on the form, that will cause the data on all grids to be updated. this update is for all grids, and should cause summary update to the grids. the problem is that grids that are not visible to the user, doesn't get updated. (not all grids visible but user can scroll to see them) i've found over the net, that this is not a bug, as it's due to performance things, that summary values updated only when the grid is visible. is there a way to force the grid to update summaries, event when it is not visible?

thanks.