Special button that brings up a [PopupMenu] when clicked. Special button that brings up a [PopupMenu] when clicked. New items can be created inside this [PopupMenu] using [code]get_popup().add_item("My Item Name")[/code]. You can also create them directly from the editor. To do so, select the [MenuButton] node, then in the toolbar at the top of the 2D editor, click [b]Items[/b] then click [b]Add[/b] in the popup. You will be able to give each items new properties. Returns the [PopupMenu] contained in this button. If [code]true[/code], shortcuts are disabled and cannot be used to trigger the button. If [code]true[/code], when the cursor hovers above another [MenuButton] within the same parent which also has [code]switch_on_hover[/code] enabled, it will close the current [MenuButton] and open the other one. Emitted when [PopupMenu] of this MenuButton is about to show.