--- a/QTfrontend/togglebutton.cpp	Mon Dec 27 23:57:44 2010 +0100
+++ b/QTfrontend/togglebutton.cpp	Tue Jan 04 12:53:46 2011 +0100
@@ -19,6 +19,7 @@
 #include "togglebutton.h"
 
 ToggleButtonWidget::ToggleButtonWidget(QWidget * parent, QString img)
+    : QPushButton(parent)
 {
     setCheckable(true);