>>There seems to be a difference between when I manually click on the button or either try to use form's submit or call click() event of the button in code.
>>
>>In the first case scenario, the passed string has

<btnRemoveOverdue>Remove+Overdue</btnRemoveOverdue>

inside it and in the other case it doesn't.
>>
>>I am wondering if that string in the post string comes from some code in C++ application or it's a standard browser behavior? Is it possible to somehow add this part to the passed post string?
>
>Yes, a post can be a combination of FORM action attribute plus the form fields. So, you can adjust the FORM action attribute to be something like MyForm.aspx?Session=1,FirstName=Test and those would be added to the post as well.

I was hoping that adding a focus on the button prior to clicking will solve my problem, but it seems not :(

Here is my current code:

if (lnKey==13)
   {
	  var btn = document.getElementById("btnRemoveOverdue");
	  if (btn)
	  {
		btn.focus();
		btn.click();
	  }

What exactly do you suggest in order to get that btnRemove inside the post string?

Thanks again.