ShowCursor doesn't work from a different thread

Hi all,
I would like to hide a mouse cursor in a .Net program.
Using both Cursor.Hide and win api ShowCursor(0) function (from
user32.dll) DOES WORK when invoked from the form thread (from the event
handler of the form); and both functions DOES NOT work when invoked
from a different thread (using System.Timer or from threadpool).
I notice also that the cursor is hidden only above the form or control
from.
So I guess this is because cursor hiding is somehow connected to a form
or a control.

Is there a way to hide a cursor (above a form) not from the thread
which "owns" a form?
Thanx.

.

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