At the Moment, you can only check with a level 1 character the skill in the "S"kill section, skill locked behinf “G”-passive tree are not checkable, even when they have already a tree. For example “holy aura”. So you need to level you character to level 29+ to see there options they offer as skill.
would be nice, if you add passive skills into a skill section under three tables, for the mastery classes.