To help with this,

I have written a code as a work around that solves the issue.
Even though the issue seems resolved with this code, after some updates and resetting the buttons, occasionally some of the newly inserted buttons gets inserted in a different position. not sure why, if it was a plugin or a google issue, or my code issue, .. or what is causing it. In any case, this new setCustomControls method, does help me add and remove buttons dynamically.

`
new Subclass to make getJson public
static class CustomControl2 extends CustomControl {
CustomControl2(Button b, ControlPosition pos) {
super(b, pos);
}

    public JsonObject getJson(int i) {
        return super.getJson(i);
    }
}

stores the elements to be removed if requested by user

List<Element[]> elements = new ArrayList<>();

this method can be called many times to reset the buttons with new buttons.

public void setControls(CustomControl2[] customControls) {
    JsonArray jsonArray = Json.createArray();
    elements.forEach(element -> {
        Arrays.stream(element).forEach(element1 -> {
            if (element1 != null) {
                gmaps.getElement().removeChild(element1);
            }
        });

    });
    elements.clear();
    for (int i = 0; i < customControls.length; ++i) {
        CustomControl2 customControl = customControls[i];
        jsonArray.set(i, customControl.getJson(i));
        customControl.getControlButton().getElement().setAttribute("slot", "customControlSlot_" + i);
        Element p = gmaps.getElement();
        Element[] e = new Element[]{customControl.getControlButton().getElement()};
        gmaps.getElement().appendChild(e);
        elements.add(e);
    }
    gmaps.getElement().setPropertyJson("customControls", jsonArray);
}

Add/remove custom controls dynamically #128

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