Removing Tabs

[NewGuy]

I'm having some problems with removing tabs from QTabWidget. I have this QTabWidget with a main tab, named (surprise!) mainTab. At runtime the user can open several new tabs to view text documents. In order to close these tabs again I have provided a push button, cmdClear. The code for the button is:

void QtTextSearcher::on_cmdClear_clicked()
{
	int count = ui.mainTab->count();
	int i = 1;
	for (i=1; i<count; ++i)
	{
		ui.mainTab->widget(i)->deleteLater();
		ui.mainTab->removeTab(i);
	}
	ui.txtOutput->clear();
	ui.txtLog->append("Cleared");
}

void QtTextSearcher::on_cmdClear_clicked()
{
	int count = ui.mainTab->count();
	int i = 1;
	for (i=1; i<count; ++i)
	{
		ui.mainTab->widget(i)->deleteLater();
		ui.mainTab->removeTab(i);
	}
	ui.txtOutput->clear();
	ui.txtLog->append("Cleared");
}

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When I press the buttton it doesn't delete all the document tabs however, it seems to always forget some. How come? I want it to delete all the tabs save the first mainTab.

Also: How can I position my QTabWidget like in the Assistant? In the Assistant the Tabwidgets are touching the toolbar, in designer I can't seem to get my Tabwidget anywhere near the edges of the mainwindow.