Submit to Dynpro Java. How to distinguish submit types?

Good day.
I have PDF from, it's embedded to WDJ component. I have two submit button in the pdf form. I want to know what button is pressed.
I have a technical parameter in the context - SubmitType. I try to set it in the method click of a WD submit button:
$record.SubmitType = 1;
                      // DO NOT MODIFY THE CODE BEYOND THIS POINT - 802.20071213024549.437972.422152 - SubmitToSAP.xfo
                      ContainerFoundation_JS.SendMessageToContainer(event.target, "submit", "", "", "", "");
                      // END OF DO NOT MODIFY
But the value in WD doesn't change. But if I use a standart button the value changes but it's impossible to submit the data. How can I resolve my task?

Krill,
Please have a look at my replies in following thread.
Dropdown List Scripting to display another Drop down List
Chintan

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