GridViewDropDownCell can't dropdown in Ansys.UI.Toolkit.TableLayoutPanel

I try to add a GridViewDropDownCell Gridview in TableLayoutPanel
But it seems can't work in TableLayoutPanel.

# -*- coding: utf-8 -*-
 
#region Globals and Initialize
import clr
clr.AddReference("Ans.UI")
from Ansys.UI import *
clr.AddReference("Ans.Utilities")
clr.AddReference('Ans.UI.Toolkit')
clr.AddReference("Ans.UI.Toolkit.Base")
clr.AddReference("Ansys.ACT.Interfaces")
import Ansys.ACT.Interfaces
import Ansys.UI.Toolkit
import Ansys.Utilities
import os
 
from Ansys.UI.Toolkit import *
from Ansys.UI.Toolkit.Base import *
from Ansys.UI.Toolkit.Drawing import *
 
global DefaultPanelEnum
global DefaultFont
 
DefaultPanelEnum = Ansys.ACT.Interfaces.Mechanical.MechanicalPanelEnum.Wizard
DefaultFont = Ansys.UI.Toolkit.Drawing.Font("Times New Roman",10)
 
#endregion
 
class ControlFramePanel(Ansys.UI.Toolkit.TableLayoutPanel):
    """
    Panel to connect to Mechanical that can host any user control.
    Panel can have headers on it to help close the window and manage some GUI actions.
    """
    def __init__(self, Control, Title, ShowHeader = True):
        self.Pane = None            #Mechanical Pane that is always there
        self.MechPane = None        #Mechanical Pane that is created when attaching control control in it
        self.MechanicalPanelEnum = None
 
        self.ImageLibrary = Ansys.UI.Toolkit.ImageLibrary()         #Image library
 
        self.PanelTitle = Title
        self.Control = Control
        self.Rows.Add(Ansys.UI.Toolkit.TableLayoutSizeType.Absolute, 25)
        self.Rows.Add(Ansys.UI.Toolkit.TableLayoutSizeType.Percent, 100)
        self.Columns.Add(Ansys.UI.Toolkit.TableLayoutSizeType.Percent, 100)
 
        self.HeaderPanel = Ansys.UI.Toolkit.TableLayoutPanel()
        self.HeaderPanel.Rows.Add(Ansys.UI.Toolkit.TableLayoutSizeType.Percent, 100)
        self.HeaderPanel.Columns.Add(Ansys.UI.Toolkit.TableLayoutSizeType.Percent, 100)
        self.HeaderPanel.Columns.Add(Ansys.UI.Toolkit.TableLayoutSizeType.Absolute, 30)
 
 
        def AddCloseButton(ImageName, ButtonText, ToolTipText, Column):
            ImageName =ImageName
            Button = Ansys.UI.Toolkit.Button()
            Button.Click += self.CloseButtonClick
            Button.ToolTipText = ToolTipText
            self.HeaderPanel.Controls.Add(Button, 0, Column)
            return Button
 
        self.ClosePanelButton = AddCloseButton("Close_Red", "Close", "Close Window",1)
 
        self.InfoLabel = Ansys.UI.Toolkit.Label(Title)
        self.InfoLabel.Font = DefaultFont
        self.HeaderPanel.Controls.Add(self.InfoLabel, 0, 0)
 
        if ShowHeader: self.Controls.Add(self.HeaderPanel, 0, 0)
        self.Controls.Add(Control, 1, 0)    
 
 
    def AddPanelToMechanical(self, OpenPanel = True, HideCloseButton = True):
        """
        Routine to add the panel to Mechanical GUI
        """
        self.MechanicalPanelEnum = DefaultPanelEnum
        ExtAPI.UserInterface.AttachControlToPanel(self, self.MechanicalPanelEnum)
        ExtAPI.UserInterface.ShowPanel(self.MechanicalPanelEnum)
 
 
    def ShowPanel(self, ShowPanel = True, Select = True):
        self.MechPane.Show()
        if Select: self.Pane.Select()
        if ShowPanel: ExtAPI.UserInterface.ShowPanel(self.MechanicalPanelEnum)
 
    def HidePanel(self, HidePanel = False):
        ExtAPI.UserInterface.HidePanel(self.MechanicalPanelEnum)
        Ansys.UI.Toolkit.Application.Quit()
 
    def CloseButtonClick(self, Sender, Event):
        if Sender == self.ClosePanelButton:
            self.HidePanel(HidePanel=True)
 
 
BoltGridView = GridView()
dropDownCell = Ansys.UI.Toolkit.GridViewDropDownCell()
DropDownItems = []
DropDownItems.append(GridViewDropDownCell.GridViewDropDownItem('Shank'))
DropDownItems.append(GridViewDropDownCell.GridViewDropDownItem('Screw'))
dropDownCell.AddItems(System.Array[GridViewDropDownCell.GridViewDropDownItem](DropDownItems))
dropDownCell.Text = 'Shank'
BoltGridView.Cells.SetCell(0, 0, dropDownCell)
 
 
Title = 'Bolt Assessment'
FramPanel = ControlFramePanel(BoltGridView, Title)
FramPanel.AddPanelToMechanical()

When dropdown the cell, the error is as following :