Hi, I just came across your thread after it appeared in the 'similar threads' to one I posted. I don't know if this is still useful to you but:
1. To open another kommander form by clicking a button you need the code
@dialog(./File.kmdr)
2. Make a button, right click, select 'edit kommander text'. Remember Kommander can accept several scripting languages including python and BASH commands (the latter you may need to use @exec(command) for)
3. I did this with a button with a pixmap icon suitable for that particular app and a link to the executable e.g. /usr/games/blackjack
hope this helps some