Java script works deferent in various browsers

See more:

ASP.NET

Javascript

Google

IE11

In my ASP.NET code I use that script :

<script type="text/javascript">
	function fireFileClick() {
		debugger;
		var objfile = Object;
		objfile = document.getElementById("<%= UpLoadButton.ClientID %>");
		objfile.click();
				}
</script>

The script is working just fine on Internet Explorer, but when I'm tying to use any other explorer is not working.
That means the "selected File" not passed to the `FileUpload` control.
Under the Chrome browser (with F12) I open the `debugger` and what I see there surprises me allot.
Which means; when the `debugger` is `on` then the file uploads on the control and the all processes goes fine.
But when the `debugger` is off then the selected file it is not uploaded to the control.
Is someone to solve that mystery?

I forgot to mention that I have two controls in ASP.NET

<asp:Button ID="UpLoadFile" runat="server" Value="Add" Text="Επιλογή αρχείου" onclientclick="fireFileClick()" onclick="ControlHasFile" CssClass="FileSelection"   />
<asp:FileUpload ID="UpLoadButton" runat="server"  />

control.

What I have tried:

Nothing more that what I mention before.