Step to reproduce issue:
1. Open the timeline.
2. Execute the command using shortcut keys instead of mouse clicks.

Actual Result:
It doesn't work for almost all commands except Play or Pause.

Expected Result:
To be able to execute commands with keyboard shortcuts, just like mouse clicks.

Additional information:
Not only does "Next" not work with the shortcut key, it also works wrong. Instead of moving to the next key, it executes "Stop" instead.