[Lazarus] German umlauts in component names

[Special]

How can I use names with German Umlauts and 'ß' in the Name Field of 
TButton components? For instance, I try to set MyButton.Name to 
"Schließenbutton" and get an error message "Komponentenname 
Schließenbutton ist kein gültiger Bezeichner".

This happens with Lazarus 1.6 and FPC 3.0.0 under Win 10 (64) and under 
Raspian on a Pi3.
We have many Delphi Programs with German Umlauts in component names and 
would like to go to Lazarus with them.
Any hints?

Hans