I can't to refresh a QAbstractItemView ??'

Sorry ... I delete the original post by error.
I explain that I had a button to add data to a model and it did not change

Solved:
The problem is :
I had :

Code:

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connect (botonadd,SIGNAL(clicked()),this,SLOT(anadir));

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And it must be :

Code:

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connect (botonadd,SIGNAL(clicked()),this,SLOT(anadir()));

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I dont understand how has been possible that the last code has not launched an error ?

Slot and signal connections are determined at run-time so the compiler will not generate an error. If you look at the application output though you should see something to the effect of QObject::connect: No Such Signal. That is why you didn't get an "error"