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First, let me explain how cxGrid works in default loading mode.
When you open some DataSet, the cxGrid saves the current position (via bookmarks), loads all data to the DataController object and restores its position in the DataSet:

[Delphi]

Code: Select all

procedure LoadData;
...
          SavePos;
          First;
...
                while not IsEOF do
                begin
                  ARecordIndex := DataStorage.AppendRecord;
                  DataStorage.ReadRecord(ARecordIndex, AValueDefReader);
                  Self.DoReadRecord(ARecordIndex);
                  Next;
                end;
...
          RestorePos;
...

However, the TZQuery incorrectly processes the restoration of the position via bookmarks.
That is why you see this behavior (Eof = true).

To solve this problem, you can manually call the ZQuery1.First method or use our cxGrid in GridMode.
Please refer to the "Grid Mode" topic of the ExpressQuantumGrid documentation to learn more about it.

Hope, it will help you achieve the required functionality.