I would copy the kf of grase pencil on dopesheet\mode: grease pencil just as is described in this link
http://wiki.blender.org/index.php/Doc:2.6/Manual/3D_interaction/Sketching/Layers_and_Animation
instead of the window displays the following error message:
“keyframe pasting is not available for Grease Pencil mode”
how can I fix it?
can be copied the keyframes into another file blend?