const QString GlobalSettings::Key_View_ColouredBG = "View_ColouredBG";
const QString GlobalSettings::Key_View_StickyScrolling = "View_StickyScrolling";
const QString GlobalSettings::Key_View_ShowSamplingPoints = "View_ShowSamplingPoints";
+const QString GlobalSettings::Key_View_ShowAnalogMinorGrid = "View_ShowAnalogMinorGrid";
multimap< QString, function<void(QVariant)> > GlobalSettings::callbacks_;
bool GlobalSettings::tracking_ = false;