Custom Nibs

Hi,

Can anyone please help me with making custom nibs in PhotoPaint X3. Yes, I can create the nib from a mask, but it gets appended to the exising set of nibs. When you save it, the complete set of nibs get saved, including Photopaint's built in ones. Trying to delete some of the nibs doesn't work. It looks like they delete, but they stay right where they are. I want to create a completely new set, with only my nibs in it. Is it possible? Also, I notice that the nibs saved from Photopaint creates the .nib file but it doesn't create a .msk file. I believe both must be present?? Any Ideas?