MercatorUi.Engine.Crm.Tools.ActionDescriptor actionToSelect = new MercatorUi.Engine.Crm.Tools.ActionDescriptor(actionEngine);
MercatorUi.Globals.Main.ShowExternalForm(typeof(MercatorUi.Forms.Action.CrmCalendarForm), "CrmCalendarForm", new object[2] { DateTime.Today.AddDays(-3), actionToSelect });