Unfortunatley, I can't drop the dynamic creation, as this app is used to maintain three different systems, and being defined by an XML configuration file, means that the page can be used to maintain multiple tables.After investigation, it looks like the Selected Index Changed is not called because on the postback with update, the Drop Down List doesn't exists, therefore the event doesn't exist.
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Ive tried peeking in the cell controls in the debugger and its just not there. Ive duplicated it in a simpler test page, with a test database.
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If I call the Bind Grid() at the start of Row Updating then the Drop Down List is available, but the selected Value is lost.