Cross Staff Tremolos

Hi everyone. I have finale 2012, and I was wondering if there was a way to create cross staff tremolos. 

I hope this helps:

1. First you create the tremolo (TG tools plug-in: easy tremolos).

2. Move the note you want in the other staff:

• Hold “Alt” and “Shift” (Windows) or “Option” and “Shift” (Mac) (*no shift in Finale 2014).
• Type the up or down arrow key (depending on which way you want to shift the notes)

sorry, duplicated

Thanks