Linked/Bound UI Buttons make GREY/BLUE ALL 3D WINDOW

Questions
1

i want linked/bound 4 buttons, but with :arrow_down: my render/renderer become GREY/BLUE, entire GREY/BLUE renderer

const buttonGroup = new BABYLON.GUI.StackPanel();

buttonGroup.addControl(buttonUp);
buttonGroup.addControl(buttonDown);
buttonGroup.addControl(buttonLeft);
buttonGroup.addControl(buttonRight);

buttonGroup.left = "-20px";
2

It is quite hard to understand what you are doing.
Could you provide a PG to have a look at?

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