When plastic interior components break, it is usually a hard-to-find piece. Traditional plastic repairs like epoxy and super glue only last a short time before splitting and breaking again, often with even more damage than before.
There is a much better way to fix broken plastic, it is called a hot stapler. Essentially, the hot stapler uses a zig-zag shape metal staple, heats it up to melt the back side of the plastic, and as it cools, it pulls the crack together, becoming a part of the panel.
The Red Dirt Rodz crew put together a video on how hot stapling works.
Red Dirt Rodz