A button that brings up a PopupMenu when clicked. To create new items inside this PopupMenu, use get_popup().add_item("My Item Name"). You can also create them directly from Godot editor's inspector.
See also BaseButton which contains common properties and methods associated with this node.
If true, when the cursor hovers above another MenuButton within the same parent which also has switch_on_hover enabled, it will close the current MenuButton and open the other one.
Warning: This is a required internal node, removing and freeing it may cause a crash. If you wish to hide it or any of its children, use their Window.visible property.