Behaviour

Children require patience. They need to feel Respected, Connected, Grounded, and at all times as if you have their best interest and will protect them - that you're not their opposition: A parent must never suffer offence or they will have immediately lost Trust which is hard to regain. 

Autistic children need some added help as there will always be a mismatch in communication and often a loss in translation, so great confusion. They need to feel you care enough to sit down at their level and Reason with them, help them understand. And help them assert agency. They need excruciatingly slow transitions and if possible, there is:

One RULE to rule them all: Never, Ever Interrupt except in Life Threatening Emergency.

I would add, make certain they are not suffering sensory assault. Carry a decibel reader, learn to understand when artificial lights can be harmful, do a little extra research on dietary issues, which can erupt from nowhere and be incredibly painful, make certain you're not creating a double-bind which will trigger a 'sense' of injustice. 

If you have details of the issue, perhaps we can better assist? 

I take the view point that behaviour is communication. If you interpret something to be ‘naughty’ then consider why the child is behaving this way and what you can do to help. 

Would you be more forgiving of ‘naughty’ behaviour if they were diagnosed? Perhaps they need support regardless?