jquery UI Modal Dialog in asp.net usercontrol: Modal Overlay only on Div in UserControl

I have an asp.net usercontrol that contains a jQuery UI Dialog Control.

All works as expected execpt the grey tranparent overlay (to make the form modal) only appears on the hidden div below the form where the dialog is triggered from.

Is it possible to target this overlay to the parent div? or is this not the right solution.

I have tried the blockUI plugin (and removing the Dialog style to prevent its overlay showing), but although it "looks" right on screen it disables all the controls including 开发者_Python百科the ones in the dialog popup.

Any ideas?

Added: Screenshot

alt text http://www.freeimagehosting.net/uploads/e0555a0ec5.jpg

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It might be a z-order issue. Can you post a screenshot to make it easier to understand. Also please post the high level HTML you are using on the aspx page.