基于Engine 的toolbarMenu不可用？

想直接调用esri提供的ControlsEditingVertexContextMenu。代码如下：
IToolbarMenu m_ToolbarMenuEditingVertex = new ToolbarMenu(); //折点编辑右键弹出式菜单
m_ToolbarMenuEditingVertex.CommandPool = axToolbarControl1.CommandPool;
m_ToolbarMenuEditingVertex.SetHook(axMapControl1);
m_ToolbarMenuEditingVertex.AddItem(new ControlsEditingVertexContextMenu(), 0, 0, false, esriCommandStyles.esriCommandStyleIconAndText);
private void axMapControl1_OnMouseDown(object sender, IMapControlEvents2_OnMouseDownEvent e)
{
if (e.button == 2 )
{
m_ToolbarMenuEditingSketch.PopupMenu(e.x, e.y, axMapControl1.hWnd);
}


问题：但是在折点编辑状态后 弹出的折点编辑菜单的功能项都是灰的