Gui window closes instantly [solved]

[MFMods]

I'm making my first gui window for a block entity. Really, I would have been surprised if things just worked on the first try...

what i have:
DeferredRegister<MenuType<?>>                         in registration class and...
RegistryObject<MenuType<my thing Menu>>       below with a register call. (i assume these two are okay because this menu type is used in inherited constructor of my Container/Menu)
event.enqueueWork(() -> MenuScreens.register       inside the FMLClientSetupEvent in client setup class.   the handler is called, i checked.
overridden  getMenuProvider                       in my block class. returns a SimpleMenuProvider which just creates an instance of my menu/container class.
overridden   use                               in my block class that calls  player.openMenu(state.getMenuProvider(level, pos));          that part is the same as vanilla crafting table and should work.

The gui window does open when i right click the block, but it closes instantly. Any ideas?

Edited May 29, 2022 by MFMods

[Luis_ST]

  On 5/29/2022 at 2:41 PM, MFMods said:

The gui window does open when i right click the block, but it closes instantly. Any ideas?

Expand  

show your Menu class

[MFMods]

  On 5/29/2022 at 4:22 PM, Luis_ST said:

show your Menu class

Expand  

Literally identical to CraftingMenu (one used by crafting table). Copy and paste. I'll trim it and change it to what I need once we get the window to stay on screen instead of just flashing.

[Luis_ST]

you need to return true in #stillValid for your own Block, since the vanilla Menus does only support one Block

you can copy the vanilla logic but you need to use your own Block instead of Blocks.CRAFTING_TABLE

[MFMods]

Yep, that was it. Thank you.