Bind contextHandler to children of contentPanel

Changes to statsPane.py:
Added new method applyBinding which loops through all the children
of the contentPanel passed to it and binds contextHandler to each of them

Changes to miningyieldViewFull.py:
Call to new method applyBinding

gui/builtinStatsViews/miningyieldViewFull.py

@@ -122,6 +122,8 @@ class MiningYieldViewFull(StatsView):
         self.parent.views.append(view)
         # Get the TogglePanel
         tp = self.panel.GetParent()
+        # Bind the new panel's children to allow context menu access
+        self.parent.applyBinding(self.parent, tp.GetContentPane())        
         tp.SetLabel(view.getHeaderText(fit))
         view.refreshPanel(fit)