求求大家了用了官方的侧边栏框架用他的文档里写的切换页面图片没了

public partial class xre_main : 网页链接 {
public xre_main()
{
InitializeComponent();
InitAccordion(accordionControl1);
}
//切换页面的操作
void InitAccordion(AccordionControl accordion)
{
accordion.Elements.Clear();
AccordionControlElement group1 = new AccordionControlElement(ElementStyle.Group)
{
Name = "User_Task",
Text = "用户操作",
Expanded = true
};
AccordionControlElement group2 = new AccordionControlElement(ElementStyle.Group)
{
Name = "user_setting",
Text = "用户配置",
Expanded = true
};
AccordionControlElement item1 = new AccordionControlElement(ElementStyle.Item)
{
Name = "command_Menu",
Text = "控制菜单"
};
AccordionControlElement item2 = new AccordionControlElement(ElementStyle.Item)
{
Name = "InstructionEditing",
Text = "指令编辑"
};
AccordionControlElement item3 = new AccordionControlElement(ElementStyle.Item)
{
Name = "oligoSynthesis",
Text = "核酸合成"
};
AccordionControlElement item4 = new AccordionControlElement(ElementStyle.Item)
{
Name = "report",
Text = "报告"
};
AccordionControlElement item5 = new AccordionControlElement(ElementStyle.Item)
{
Name = "confidence",
Text = "软件设置"
};
AccordionControlElement item6 = new AccordionControlElement(ElementStyle.Item)
{
Name = "command_Setting",
Text = "指令设置"
};
AccordionControlElement item7 = new AccordionControlElement(ElementStyle.Item)
{
Name = "base_Setting",
Text = "碱基设置"
};
AccordionControlElement item8 = new AccordionControlElement(ElementStyle.

又听说我没赋予图片 但是他的optionimage该怎么写啊怎么赋值

AccordionControlElement item1 = new AccordionControlElement(ElementStyle.Item)
{
Name = "command_Menu",
Text = "控制菜单",
Image = Properties.Resources.测试img
};