Connect a detail table to a master table via MasterSource property
Open the key assignment dialog.
Select Master and detail key fields and press ok.
Reopen the dialog - you will notice that the detail field is no 
longer what you selected before.

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 Comments and Workarounds

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If this problem occurs the workaround is to just assign the MasterFields property directly using the Object Inspector or runtime code. This problem has been fixed in 3.0, which uses the standard Borland master-detail field link dialog.

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 Resolution

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Scheduled for Future Release on in version 0.00 build 1