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How can I print to a Dymo 450. How do I adjust the pagesize of Richviewedit to the correct size of the dymo printer and how do I print it that it shows correctly.
for example in the demo ActionTestTabsRibbon. I cannot find the correct page size (A8 or A9?) it should be 30252

please help

The menu contains the most frequently used paper sizes.
To define an "exotic" paper size, open the page setup dialog. Click "+" button next to the list of page sizes. You will be able to choose from a huge count of formats, including A8 and A9.
PS: make sure that you set the appropriate margin sizes for such small formats.