But when trying to reparent bones i get the following:

Any ideas as to why? and what can i do about this?

thanks in advance Nim
Edit: o.k. just found how to do it...
first click on "select bone" then "reparent bone" then hold the "control key" and select a new parent bone.
This is in contrast to what it says in the bar!
"click to attach bone to a new parent (hold <alt> to select a new bone)"