>Do you know what are the changes between beta 3 and 4?

They are mostly fixes. I did a fairly serious project last year with B3 and I found a number of errors that I fixed and sent back the fixes to Dave. I am hoping that most of these fixes made it into B4.

However, interestingly enough, the latest release of CM7.5 (.1, I think) provides a grabber class and also appears to support the embedding of CDEs into other CDEs whereas the orginal 7.5 version did not (only allowed creating nested CDE's "on the fly" rather than at design time). Since this is, IMHO, one of the biggest features of CM8, and it is now available in 7.5, I would be very inclined to develop any other Codemine system in 7.5, at least until CM8 becomes "officially" of release quality.

Good to speak to you!

Best