public override void OnCreate(object Hook) { base.OnCreate(Hook); this.m_SkylineHook = base.m_Hook.Hook as Skyline.Define.ISkylineHook; // For Old Command if (application3D == null) { application3D = new Application3D(null); application3D.MainForm = this.m_Hook.UIHook.MainForm; } this.m_OldCommand.Application = application3D; }