1. Navigation keys

• Enter: On a terminal node of the tree, opens the corresponding dialog. On a branch node (sub-menu), it opens or collapses the branch.
• Up/Down: Moves Up and Down in the tree.
• PageUp/PageDown: Moves one page up or down in the tree.
• Left: Collapse the current branch and record the relative position of the cursor in the branch.
• Right: On a terminal node, does nothing. On a branch node, it opens the branch. If this branch was collapsed using the Left key, it will reposition the cursor at the same line where the Left key was used. Using Left and Right combination, you can travel in the tree very efficiently.