Strange in Design Form's Preview

edited 12:13AM in FastReport 3.0
I try the fr3 download from this site and designed a master-detail report.
When first click preview button in designer, there is no data show, but the second time, all data show correct.
All frxDataSet/TDataSet(which I use TADOTable)/TDataSource is dynamic created in application, and I can see the DataSet in designer, the report component use default values, can anybody help me? THX!

P.S: How can I show the detail data band even if there is no data for it?

Regards.

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