How to open a data processor instead of opeing the catalog item?

Hello!

I want to make a pseudoform for my catalog items which will execute some procedures depending on the catalog item. So I have created a data processor and open its form with catalog item ref as a parameter in BeforeRowChange event handler.
The problem is that both the data processor and catalog item forms are opened. How can I suppress opening the catalog item form?

You can use event OnOpen of Item Form.
This code in event work:

Cancel = true;
OpenForm("DataProcessor.DataProcessor1.Form.Form");

You can avoid changing the catalog item form by setting

StandardProcessing = False;

Thanks! StandardProcessing = False; is easier.