[1.16.5] Adding a gui button to the vanilla in-game menu

[Novality]

package novality;

import net.minecraft.client.gui.GuiButton;
import net.minecraft.client.gui.GuiIngameMenu;

public class NovalityAddButton extends GuiIngameMenu {
	private GuiButton mEnter;
}

I don't really know where to go from here. If anyone could point me in the right direction, that would be great. I want my button to open another gui I created that extends from GuiScreen.

[Novality]

1 hour ago, diesieben07 said:

You should really consider not doing this. If multiple mods do this, the menu will quickly become completely unusable.

Why do you want to do this?

If you must add a button to an existing screen against all advice then you need to use GuiScreenEvent.InitGuiEvent.

I understand the concern and possibility of unfriendly mod compatibility. I'll be sure to add an option to disable it then as I'll probably have a keybind to open the same gui as well. The button will be there though, at the very bottom of the screen to bring user's attention to configuration.

I've actually played around with GuiScreenEvent.InitGuiEvent before and I don't recall being able to add a button to the button list?