[Lazarus] BidiMode improvments patch

[Zaher Dirkey]

Hi, thanks for the replay
@Paul
If it is just TMenu i have no problem, but there are a another
components (TTrayIcon, ...), and some components i have plan to create
it in my job.

@Hans
The trigger will be done by dispatch message CM_PARENTBIDIMODECHANGED,
but i am who prefer to call virtual methods instead of perform
messages to components.

Thanks in advance.
-- 
Zaher Dirkey