How do i display the Collapse Menus checkbox in a Python menu? The right click Header menu at the header is a C menu. I want to display the content in a Python menu. Like the View menu of the Text editor.

I can grab the operator, create my own class to execute it. And that way i can display the Flip to Top button. And it is fully functional. But how do i display the Collapse Menus prop with its checkbox? layout.operator is functional, but doesn't display the checkbox state. And layout.prop gives errors since i execute an operator, and don't have a prop involved here yet.

My problem is how the things needs to be connected, how the prop should look like. I cannot create a new prop here, it already exists. Or am i at the wrong track here? Maybe there is a direct way to grab this prop? As told it's a C menu, not Python.

The vital code parts are also marked green in the following screenshot:

class VIEW3D_MT_testheaderflip(bpy.types.Operator):
"""tooltip"""
bl_idname = "view3d.headerflip"
bl_label = "header flip"
bl_options = {'REGISTER', 'UNDO'}

def execute(self, context):        # execute()
    bpy.ops.screen.header_flip()
    return {'FINISHED'}  
...

layout.operator("view3d.headerflip", text="headerflip")
Not sure how to expose the property that indicates whether the header region menu is collapsed or not. You can however add the bpy.ops.screen.header_toolbox() operator to the view menu.  This is the header menu that pops up when right clicking in Header.

Notice I've appended / prepended to the view menu class, rather than, (.. the slippery  slope of), editing the UI py.

import bpy


def header_toolbox(self, context):
    layout = self.layout
    #layout.operator("screen.header_flip")
    layout.operator("screen.header_toolbox")

# prepend to 3d view view menu
bpy.types.VIEW3D_MT_view.prepend(header_toolbox)
# append text editor view menu
bpy.types.TEXT_MT_view.append(header_toolbox)