How to use LiveGraphics3D by Martin Kraus
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As soon as the pointer enters an applet zone the applet takes the focus and keeps it until it leaves the zone (click outside an applet to reactivate the keyboard shortcuts).
If, to reach a pop-up window P, the pointer goes over an applet in the main window M, this applet, and thus also M, picks up again the focus and may hide P (use the task bar to give the focus back to P, or minimize M).
Below "left"/"right" points out the mouse's button to use, and "Shift"/"Ctrl" the additional key to maintain.