How To Access To Child's Of A Tab

[hotjava]

Hi!
How i can access to a child widget of a tab???
for example
I have 3 tab. in all tabs i have placed a Button named New
i need to access to New Button from Code.
i have tried this code but...!

for(int i=0; i < this->tabwidget->count(); i++)
{
  this->tabwidget->widget(i)->btnNew->setEnabled(false);
}

for(int i=0; i < this->tabwidget->count(); i++)
{
  this->tabwidget->widget(i)->btnNew->setEnabled(false);
}

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Please Help Me!
Thanx.