[Avodah] Showing affection to children in beit k'nesset

[Simon Montagu]

The article that RSBA linked to in the thread "Tzelem
beHeichal"http://tinyurl.com/4td899says:

"We aren't allowed to show affection to our very own children in a *beis
haknesses*, for our affection and reverence must be focused on Hashem."

I was not previously aware of this halacha. What is the source? In the batei
k'nesset that I attend it seems to be universal practice that fathers cover
their children with their tallit during birkat kohanim and kiss them
afterwards. Is that an exception to the rule or a minhag shtut?
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