How to disable symbol editing in Run mode and refresh the symbol automatically if new tag is dropped on it.

Hello,

I am working on a custom tabular symbol in which I would like to achieve the following:

1. If new tag is dropped on the symbol, display switches to build mode just like a native symbol.
2. If new tag is added, the symbol refreshes automatically without explicit refresh.

At present, it allows editing even in run mode. If new tag is dropped on the symbol, it requires page refresh to show the updated symbol.

In addition to this I would also like to know if we can inherit configuration pane options like font size, fill text etc. from native symbols.

Thanks