More specific in a b4xpage may be you are loading a layout with objects named button1, button2, button3... and loading them in different form... because of their nature (b4xpage)...
But in same form if you have tabpanes (panels too) you must have different layouts, and names for them, for their events... routines and a way to know every control-object...
- Wouldnt be easier if tabpanes were b4xpages too and in same form!!!... ? reusing a b4xpage... simple and fast...
- Also will be to easy create then mdi-child like forms... (will simple panes) and will be easy to create any style for them too...