1) In order to make .net controls work in a jquery UI dialog the dialogs need to attach to the form instead of the document.

This can be done with the follow modifications Change line 8816 in jquery-ui-1.8.5 to .appendTo((document.forms.item(0) != null) ? document.forms.item(0) : document.body)

Change line 9036 in jquery-ui-1.8.5 to uiDialog.appendTo((document.forms.item(0) != null) ? document.forms.item(0) : document.body);

That will allow .net control hosted in a dialog to function properly.

This however raises a new issue. Since the dialog is now in the form, it needs to not post back when you click its buttons. To fix this change line 9102 in jquery-ui-1.8.5 to var button = $('<button type="button"></button>', props)

This will create an issue with the some of the internal functions specifically rsingleTag.exec( selector ) on line 114 in jquery-1.4.2.js. The regular expression doesn't understand that a single tag could have attributes. It can be corrected by change line 51 in jquery-1.4.2.js to

rsingleTag = /<(\w+)(\s+\w+="?\w+"?)*\s*\/?>(?:<\/\1>)?$/,

Make the inner/outer width/height functions act as setters.

​http://jsfiddle.net/Geler/bWsTS/1/

When we use outerWidth(1) with the UI on its set the width of the object, with 1.8.7 to 0px and with 1.8.5 to 1px. Work fine if you remove UI.