wxpython ListCtrl无法更改所选项目的颜色

import wx

class MyFrame(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None, title="ListCtrl Example")
        
        # 创建ListCtrl
        self.list_ctrl = wx.ListCtrl(self, style=wx.LC_REPORT)
        self.list_ctrl.InsertColumn(0, "Name")
        self.list_ctrl.InsertColumn(1, "Age")
        
        # 添加数据
        self.list_ctrl.InsertItem(0, "John")
        self.list_ctrl.SetItem(0, 1, "25")
        self.list_ctrl.InsertItem(1, "Alice")
        self.list_ctrl.SetItem(1, 1, "30")
        
        # 绑定选择项目事件
        self.Bind(wx.EVT_LIST_ITEM_SELECTED, self.on_item_selected, self.list_ctrl)
        
    def on_item_selected(self, event):
        # 获取所选项目的索引
        index = event.GetIndex()
        
        # 更改所选项目的背景颜色
        self.list_ctrl.SetItemBackgroundColour(index, wx.Colour(255, 0, 0))  # 设置为红色
        
        event.Skip()

app = wx.App()
frame = MyFrame()
frame.Show()
app.MainLoop()