Question: Can I used javascript to open a new tab in the browser, but not switch to it?

Now i use:

```
<script>window.open("url")</script>

```

UPD
May be I'm stupid, but

```
<script>
function openWin(){
    popupWindow = window.open("url");
    popupWindow.blur();
}
openWin()
</script>

```

dos'n work... It's opening tab, but focus on it.

Answer: 
First line of your code. Remove the following.

```
OnSelectedIndexChanging="grdFacetsAssigned_SelectedIndexChanging"

```

Second Line

```
OnSelectedIndexChanged="grdFacetsAssigned_SelectedIndexChanged"

```
What I did for this was a workaround in the checkbox event handler...

```
            if (Page.Request.Params["__EVENTTARGET"].IndexOf("chkFacetAssigned") < 1)
        {
            return;
        }

```

This ensures that the event is ignored unless it is responding to a postback that was initiated by the checkbox and not the grid.