How to close popup window when button is pressed ...?

Coding Python Support
1

Simple popup windows, the usual “Cancel/OK” stuff.


import bpy

class FOO_Panel(bpy.types.Panel):
    bl_label = "FOO"
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'TOOLS'
      
    def draw(self, context):
        layout = self.layout    
        column = layout.column(align=True)
        column.operator("popup.message")

 
class PopupOP(bpy.types.Operator):
    bl_idname = "popup.message"
    bl_label = "Simple Popup"
 
    def execute(self, context):
        return {'FINISHED'}
 
    def invoke(self, context, event):       
        return context.window_manager.invoke_popup(self,width=200, height=100)
    
    def draw(self,contest):
        self.layout.label("Popup Message")
        row = self.layout.split(0.5)
        row.operator("render.ok")
        row.operator("render.cancel")
        
class OkOP(bpy.types.Operator):
    bl_idname = "render.ok"
    bl_label = "OK"    
    
    def execute(self, contest):
        return {'FINISHED'}
            
class CancelOP(bpy.types.Operator):
    bl_idname = "render.cancel"
    bl_label = "Cancel"
    
    def execute(self, contest):
        return {'FINISHED'}
  
classes = [
    FOO_Panel,
    PopupOP,
    OkOP,
    CancelOP
    ]

def register():
    for c in classes:
        bpy.utils.register_class(c)
    for area in bpy.context.screen.areas:
          if area.type == 'VIEW_3D':
              for region in area.regions:
                  if region.type == 'TOOLS':
                      region.tag_redraw()        
    
def unregister():
    for c in classes:
        bpy.utils.unregister_class(c)

if __name__ == "__main__":
    register()

The problem is, I’d like the popup to close if you either click “cancel” or “ok”.
Can this even be done? The API docu hasn’t made me any smarter - unfortunately.