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Yes, you need to subscribe to `GuiScreenEvent.InitGuiEvent.Pr e event)` in order to add widgets, the event itself has a method `addWidget`. Here's an example of how it could be used: @SubscribeEvent public void addCustomButtonToInventory(GuiScreenEvent.InitGuiEvent.Pre event) { if (event.getGui() instanceof InventoryScreen) { event.addWidget(new Button(x, y, width, height, text, button -> { Minecraft.getInstance().displayGuiScreen(new CustomGUI()); })); } } If you aren't familiar with the `button -> {...}` syntax, this Button constructor takes an Button.IPressable as a parameter, which is the behavior that happens when you click. Equivalent code would look like this: @SubscribeEvent public void addCustomButtonToInventory(GuiScreenEvent.InitGuiEvent.Pre event) { if (event.getGui() instanceof InventoryScreen) { event.addWidget(new Button(x, y, width, height, text, new CustomAction())); } } class CustomAction implements IPressable { public void onPress(Button button) { Minecraft.getInstance().displayGuiScreen(new CustomGUI()); } } Hope this helps!

You can downgrade to 1.16.1 and remove 1.16.2 mods or you can update your 1.16.1 mods to 1.16.2. Make your own topic.

You are using 1.16.1 mods on 1.16.2.

I do not believe that it is supported.

Step 1. Learn Java Step 2. Stop using MCreator and make your mod properly