protected override void AppendAdditionalComponentMenuItems(ToolStripDropDown menu)
{
foreach (PanelType pt in Enum.GetValues(typeof(PanelType)))
GH_Component.Menu_AppendItem(menu, pt.ToString(), Menu_PanelTypeChanged, true, pt == this.panelType).Tag = pt;
}
where this.panelType is a variable in the component context.