I'm a bit confused regarding the feasibility of placing a rectangle on top of an existing table. Is this possible to achieve?
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Can you please share, either you are trying to add rectangle to a table in any existing PDF document or trying to place it over the table while generating the PDF document from scratch. If possible, please also share the code snippet that you are using, so that we can test the scenario at our end.
In case you are creating a PDF document from scratch, you can simply add the graph object (rectangle) to paragraphs collection of section, before the table is added. And you can specify proper coordinates to place the rectangle over correct position. For more related information, please visit Working with Graphs
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