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Open the form in the Design view. Open the "Document Structure" - "View" | Other windows | The structure of the document is ( Ctrl+ Alt+ T).
The document structure displays the layout panels in a tree view in the reverse order that they appear on the form. In the "Document Structure" window, you can change the order of the panels. Due to the reverse order, everything shown at the top of the document will be at the bottom of the form.
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