Hi Matt,
There shouldn't be a problem with embedding an <object> tag in the tooltip. The only issue I am aware of is that silverlight and flash objects tend to reload when their parent's visibility, display, size and a number of other properties are changed, thus it will happen several times as the tooltips shows because it needs to size, reposition and generally configure its popup. The best advise I can give for the moment is that you simply try it out and see how it works for you. I can also suggest you examine
this online demo, as it shows two different ways to add tooltips to a grid - a manager with LOD (AJAX) and a regular tooltip with content in the markup.
All the best,
Marin
the Telerik team
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