Hi, I have a strong desire to be able to extend propertysheets with more types possibly adding checking for them. For instance be able to specify URLs, email addresses, ISBN-number etc. Is this good idea at all? What would be the risks? Cheers, Johan Carlsson zYbh:)zib3j)fjb?Ί^u͡h(t-ܡاjם+-mlΊ^?+-w:)yzmlΊ^?+-w:)