Hello Marc,

I'm sorry, but I'm afraid to say, as far as I know, there is no option to
turn off this behavior.
When we double-click on control, VS IDE will switch to code page, and add
click event handler automatically. This is very helpful on coding and we
cannot stop it.
We are indeed sorry for any inconvenience this may have caused.

By the way, if you really have concern on this very much,  we suggest you
can also post the issue to our Connect feedback portal.
Our developer will evaluate them seriously and communicate with you
directly on the issue there.
http://connect.microsoft.com/VisualStudio/
Improving the quality of our products and services is a never ending
process for Microsoft.

If there is anything else you feel we can help with, please feel free to
let us know. It's my pleasure to assist you.
Have a great day,
Best regards,

Wen Yuan
Microsoft Online Community Support
Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
msdnmg@microsoft.com.
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