Get selected row from Picker in Titanium Alloy

In Titanium Alloy I have made a Picker that consists of 'rows'. Users can select one of these rows and click a button to continue to the next window. What I want is that the button sends the user to the right window depending on the selected row in the picker. My code is as follows:

Alloy:

<Alloy>
    <Window>
        <Picker id="picker">
           <Column id="rows">
                <Row title="Row1" />
                <Row title="Row2" />
                <Row title="Row3" />
                <Row title="Row4" />
           </Column>
        </Picker>
        <Button id="button" title="Confirm" bottom="10%" width="115" height="50" />
     </Window>
</Alloy>

JavaScript/jQuery:

$.picker.addEventListener('change',function(e) {
    var selectedrow = e.rowIndex; // e.rowIndex determines row number
});

$.button.addEventListener('click',function(e) {
    if(selectedrow = "3") {
        $.tabs.open();
    }
    else {
        $.tabs2.open();
    }
});

The problem is that every selection sends the user to the same new window, like the else-statement is being ignored. How can I fix this?