Use the Redo command from the Edit menu to reverse the last action that was undone.
You can repeat the Redo command to step forward and redo actions that were previously undone.
To redo the last action undone
Select the Redo command from the Edit menu
Press Ctrl+Y
Click the Redo toolbar button
Right-click in the Script Code pane and select Undo from the menu that is then displayed
Your previously undone action is then redone.