Regression to master.
In long term it would be better to define ChartWindow as an
OpenGL window and not creating a new window inside the chart
window, becasue otherwise all events which was handled well
by the chart window will be broken (catched by the OpenGL
window so no effect on ChartWindow (defining the behavior of
charts in general) or catched by the ChartWindow and so no
effect on the OpenGLWindow (like invalidating in this case).

Change-Id: I234f469f70914e01f030c8edae9cb5aacea112bf