After open, claim and enable, POSTest2 only allows to set the screen mode. This is not correct: The UPOS specification tells us that this property can only be updated after open and claim but only while the device has not been enabled. Therefore, the correct processing would be to allow setting screen mode after open and claim, but no longer after enable. Instead, all other operations should be possible after enable.
Fixed, reason was that visible attribute for TabPane tag was wrong. See attachment.