BgControl Library Method
Short Description: Enable/Disable Background Control
Signature: taccgl.BgControl (b)
Class: taccgl Class
Enable (b=true) or disable (b=false) background control mode as discussed
in Background Mode. Disabled by default.
If disabled the animation canvas is shown in front of all the other HTML elements.
If enabled the method foreground is used to control when the canvas
is in foreground or in the background. While at least one transition is running
that is defined using foreground the animation canvas is shown in front.
During the remaining time it is in the background.
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