Often pounding pounding the code is lost the focus

In particular, when the code ,, knock knock positive greedily then, suddenly lost focus, we can not continue knocking is really annoying! !
So the Internet to find a solution to the great God here we transferred to the link, hoping to help you.

Links: computer no reason to lose focus, who the culprit is?
Quoted from csdn Wu Rui Aoxue

But I found that my problem more than that, loses focus, the handle shows a value of 0, unable to find it.

I want to have children know how great God's message to help solve what, thank you very much.