<p>We're using Infragistics grid (most probably, we'll have 8.2 version at the end) and we want to configure row/cells appearances "on-demand" in order to be able to provide sort of "dynamic appearance".</p>

<p>For example, I want some cell to be red or green, depending on its value. We might want to tweak other characteristics as well (font, size, image, etc).</p>

<p>A perfect place to do it would be some event, that happen before a cell gets repainted... But it seems there is no such event in Infragistics...</p>

<p>Or am I wrong? Any help?</p>

<p><strong>Clarification:</strong> I'm talking about WinForms Infragistics UltraGrid</p>

There is an event.  I don't remember exactly what it's called, but it's got to be something like 'DataRowBound' or 'ItemDataBinding', etc..
Also,
this article
might help.
Not that this has anything to do with your question, but I'd stay away from heavy use of Infragistics controls - they're very heavy and will slow down the page rendering process considerably.  Just my $0.02.