WIth this setup the confirm dialog will always be centered in the browser, as this is its purpose. Since this functionality is encapsulated you can hardly get a reference to the popup in order to move it, so I would suggest going with a more customized approach - you would need your own button (i.e., in a template column) so you can call the RadConfirm with your own script in order to have a reference to it (the radconfirm() method returns that reference). Once you have it you can use the RadWindow's client-side API and call the moveTo() method to center it above the grid (or, generally, move it around in the screen).
The following resources would be helpful in this task:
- to see how to confirm clicks on a button
- RadWindow's API
- our static client library that you can find useful when calculating positions and dimensions. Of course, any other means can be used to get the desired position, e.g. jQuery
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