I found the problem.
If I select, in tpconfig, "Medium: Plain paper" then there is only "Plain Paper" available in the "Media Type" property.
If I select, in tpconfig again, "Medium: CD printable" then all options are available in the "Media Type" property.
For this test, it is required to close the OpenOffice application to see the changes.
Is this an issue ?
Thanks for your help.