Keeping persistent layer (div with style) coordinates ?

[Guillaume]

Hi all,

I want to keep the coordinates of my rendered WebControls.Panel,
because i wand to provide drag&drop fonctionnality.
I thought that it was possible to let ASP.NET deal with the
coordinates in the ViewState, i launch the PostBack on drag end event,
the LoadPostData fires, but i cannot retrieve my coordinates in the
postCollection[postDataKey] because it's null ?

Is there something about the second argument of GetPostBackEvent
function ?

Or is it useless to implements IPostBackDataHandler for controls that
are not input fields ? If yes, i have to put the coords in inputs
hidden fields ? And then retrieve them in the Load ? If that's it, i
don't understand very well the ViewState interest.

Thanks in advance