Arrrggh :) This doesn't quite work but I though I would post it anyway as it might provoke a thought

In conjunction with my other two requests about editing SQL output columns with QT and exposing a cell reference in CustomExpressionBuilder so you know exactly which cell the ellipsis was clicked on.

Both of these requests could be 'avoided' if when using the CustomExpressionBuilder the Expression, Criteria and Or cells were all made 'read-only'

By that I mean you can click the ellipsis to launch a custom dialog to do what you like in, even provide a free type text box if one wishes but when the text is returned to the cell, if it is read only, You then know when the user next clicks on the ellipsis the OldExpression value will be as you set it i.e. they can't change it, the custom dialog is in total control

It doesn't get around one really needs to store some metadata to save having to 'reverse engineer' the OldExpression string to populate the custom dialog ..... but at least you would be in control of what you were reverse engineering

Thanks for listening !