Some handler or method to run after cell rendering on scroll

How do you highlight the cells?

If you use BeforeCellRender (http://doc.daypilot.org/scheduler/cell-customization/) the custom styles will be applied properly no matter when they are rendered. If they are not it might be a bug.

I'm highlighting the cells through javascript, after the scheduler is loaded. That's because I need to change the highlights based on some selected time on the page.

There is a new cell-accessing API in the works which you can use. It is available in the latest MVC sandbox build (7.5.5597):

http://mvc.daypilot.org/sandbox/Scheduler/

You can use the following API:

dps.cells.find(start, resourceId)
dps.cells.findXy(x, y)

These methods will return jQuery-like objects which you can use to modify the cell properties:

dps.cells.find("2013-09-01", "A").cssClass("sunday");  // add .sunday class to this cell
dps.cells.findXy(0, 0).cssClass("sunday");  // add .sunday class to this cell

At this moment it only selects one cell specified using its coordinates but it will be possible to select whole rows or columns (and possibly use other selectors). Something like this:

dps.cells.find("2013-09-01").cssClass("sunday");  // not implemened yet

It is possible to use the following methods on the returned class:

.cssClass() -- adds a CSS class to the cell div
.html() -- modifies the cell HTML
.each() -- applies a custom function to all the found cells

It is possible to chain the method calls:

dps.cells.find("2013-09-01").cssClass("sunday").html("free");