[Lazarus] Why no WordWrap in TCheckBox, TRadioButton etc

[Žilvinas Ledas]

Hello

Is it possible to store an empty string property?

The property is getting a default value a creation time (GetUserDir),
If the user enters an empty string to the obj. insp. it is shown as 
empty but still has the value it got at creation time when run.

I've tried things like:
 property Directory: string read FDirectory write SetDirectory stored 
True nodefault;

but it doesn't work. Empty String is never stored it seems.

Am I missing sth.?

Thanks
Theo