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Should the Sub Tag <imagesize/> be defined as required. I don't think any <subtag/> and the subtag attribute group be required. There should be default values for subtag attributes. If the <imagesize/> is not defined than the custom interface should only be offered in embedded and (with a button, not combobox ) popup mode. Currently the <imagesize/> must be defined for the combobox list to be used.
Check for RC1, this sounds like a bug ... or at least a reasonable way of handling a common situation.