@ claudio

There is no specific keyboard assignment for the T-Bar.
You can assign any key as a shortcut key for the transition you desire (Fade, Cut, Wipe or Zoom).
This is done in "Settings" (button at top right)
With "Shortcuts" option (near bottom of left menu in pop up window)
Click "Add"
Choose your Key, Function, Duration and Input (typically "Preview" if you are replicating the T-Bar function)
Hope that helps.


Ice