I always like to say that anything is possible, it's just a question of how much code it will take.  In this case, you'll want to add an event listener to the row element for mouseover.  On that event, you can use the WebDialogWindow to pop up a window (or you can use a div element but that will require a little more work).  The hard part will be figuring out how to link a row, with it's child data, and where that data gets stored.  I'd recommend using an IFrame, and passing in a querystring parameter with the parent row key. 

Hope this helps,

-Tony

 I am looking to do something similar.  I want to be able to mouse hover over a row, and show heirarchical data, instead of leaving that data in the grid which needs expansion.  The image linked here has the Order data, which is what I would like to show in a hover "bubble" instead of in the grid itself, is this possible?

Thanx for the possible help!

 BJ

You could use the client-side events of the WebGrid but you'd have to manage hiding and showing the menu yourself.  The problem with assigning a RowID to each row is that it requires each row to be a WebControl, which is an extremely heavyweight way to do things. 

Can you explain a little more the scenario you are attempting to support by using the HoverMenuExtender?  I think once I understand that scenario, I can offer some alternatives.

-Tony

Thanks, Tony! 

I need server side row ID like Microsoft's grid to use HoverMenuExtender to show a menu for the row that mouse is over, and the hover menu should be outside the grid.

Is there any pure Infragistics way to do this?