If you are writing VBA code in a workbook that contains a PrecisionTree model, you should be aware that a hidden module, with the name "PTModule" is created when the first PrecisionTree object is created in a workbook. This module contains an Auto_Open procedure. If you have your own Auto_Open routine that must be run when the workbook is open, you should name it "My_Auto_Open". It will be called at the end of the PrecisionTree Auto_Open routine.