public void DeleteProcessing() { ToolpathObjectsGroup?.DeleteGroup(); ToolpathObjectsGroup = null; TechOperations.Select(p => p.ToolpathObjectsGroup).Delete(); TechOperations.ForEach(p => { p.ToolpathObjectsGroup = null; p.ProcessCommandIndex = null; }); ExtraObjectsGroup?.DeleteGroup(); ExtraObjectsGroup = null; ToolpathObjectIds = null; ProcessCommands = null; }