diff -r 804e9076d136 -r 83dd3447a212 QTfrontend/ui/page/AbstractPage.cpp
--- a/QTfrontend/ui/page/AbstractPage.cpp	Fri Feb 17 15:55:31 2012 +0100
+++ b/QTfrontend/ui/page/AbstractPage.cpp	Fri Feb 17 17:43:59 2012 +0100
@@ -48,6 +48,7 @@
 
     // add back/exit button
     btnBack = formattedButton(":/res/Exit.png", true);
+    btnBack->setWhatsThis(tr("Go back"));
     pageLayout->addWidget(btnBack, 1, 0, 1, 1, Qt::AlignLeft | Qt::AlignBottom);
 
     // add body layout as defined by the subclass