I want remember the position of the panel，Who can help me

Scripting
8 
# -*- coding: utf-8 -*-
import Eto as e
import rhinoscriptsyntax as rs
import scriptcontext as sc
import Rhino

command_name = ''

# button color
default_color = e.Drawing.Color(0, 0, 0, 0)
color_a = e.Drawing.Color(0.682353, 0.772549, 0.901961)
color_b = e.Drawing.Color(0.54902, 0.870588, 0.760784)
color_exit = e.Drawing.Color(0.921569, 0.882353, 0.486275)
prev_color = e.Drawing.Color(0.921569, 0.513725, 0.513725)

# button dict list
column_dict_list = [[{'text': '锁 定', 'cmd': '_Lock', 'color': color_a},
                     {'text': '解锁选取', 'cmd': '_UnlockSelected', 'color': default_color},
                     {'text': '解 锁', 'cmd': '_Unlock', 'color': default_color}],
                    [{'text': '曲面上曲线', 'cmd': '_InterpcrvOnSrf', 'color': color_b},
                     {'text': '单 轨', 'cmd': '_Sweep1', 'color': default_color},
                     {'text': '双 轨', 'cmd': '_Sweep2', 'color': default_color},
                     {'text': '退 出', 'cmd': 'exit', 'color': color_exit}]]


class CustomDialog(e.Forms.Dialog):

    def __init__(self):

        def define_button(_i, _j):
            item = column_dict_list[_i][_j]
            btn = e.Forms.Button(Text=item['text'], Height=25, ID=item['cmd'], BackgroundColor=item['color'],
                                 click=OnButtonPress)
            return btn

        def OnButtonPress(sender, e):
            global command_name  # global variable
            command_name = sender.ID  # ID = command name
            sc.sticky['prev'] = command_name  # record command name to rhino sticky
            self.Close()  # close ETO dialog

        # ETO layout
        layout = e.Forms.DynamicLayout()
        layout.BeginHorizontal()
        for i in range(len(column_dict_list)):
            layout.BeginVertical()
            for j in range(len(column_dict_list[i])):
                layout.Add(define_button(i, j))
            layout.EndVertical()
        self.Content = layout

        # load previous button
        if 'prev' in sc.sticky:
            prev_command = sc.sticky['prev']  # load recorded command name
            last_button = layout.FindChild(prev_command)  # find the button
            last_button.BackgroundColor = prev_color  # change background color
            last_button.Focus()  # set focus to button


dialog = CustomDialog()

# load previous dialog position
if 'pos' in sc.sticky:
    dialog.Location = sc.sticky['pos']

dialog.ShowModal(Rhino.UI.RhinoEtoApp.MainWindow)

if command_name != 'exit':
    rs.Command(command_name)

# record current dialog position
sc.sticky['pos'] = dialog.Location
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