[1.2.3] Header height change after 3 cards added !

[zull]

Hi,

A bug in the WizardWindow that change the header size after adding 4 or more cards.
the result is different depend on browser, normal with FF and abnormal with hosted/IE.
here is the code to unveil it :
ArrayList<WizardCard> cards = new ArrayList<WizardCard>();

for(int i = 0; i < 4; i ++) {
WizardCard wc1 = new WizardCard("My card ");
wc1.setHtmlText("simple Text , card number " + (i+1));
cards.add(wc1);

}
WizardWindow win = new WizardWindow(cards);
win.show();


And in attachement screenshot of the problem
Thks