Confirmation message?

I have a button to save some process in my APPayments Form.

In this Form i have a Button to generate an XML and set the Payment as "Generated".

When click the button, the process run and set the values.

But... I need a confirmation message on this button:

Ok: run the process normal

Cancel: this option cancel the process to set the "Generated" value

 

How can i set a confirmation message?

I code in Visual Basic.

 

Sorry for my english

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