implementing Copy Layout under Halley

Since Biela is still unstable release, while the new Copy Layout feature is a neat feature, so I intend to re-implement the idea on halley server using Biela source code.

I've managed to copied the code:
1. CopyForm() and Copy() functions on layout.class.php
2. Copy(...) function on layout.data.class.php
3. LayoutGrid() functions on layout.class.php - to add the button as necessary.

However the CopyForm doesn't show up when I press the Copy button. Is there anything that I'm missing here to make this work? Since there is no error log on the database. Can someone help me to point me to the right direction? thanks in advance.