Below code is not handelling new window in selenium webdriver - selenium-webdriver

Question

To handle multiple windows I have written below code. Its not giving me any error, however no action is getting performed on new window. Can you please help me to fix this issue or suggest me any other way. Thanks!
Code:
public static void main(String[] args) throws InterruptedException {
// TODO Auto-generated method stub
FirefoxDriver dw2 = new FirefoxDriver();
dw2.get("http://quercus0638v.quercus.kpn.org:90");
//OPEN login and provide credentials
dw2.manage().window().maximize();
Thread.sleep(2000);
dw2.findElement(By.id("ContentPlaceHolder1_GebruikersnaamTextBox")).clear();
dw2.findElement(By.id("ContentPlaceHolder1_GebruikersnaamTextBox")).sendKeys("behdse");
dw2.findElement(By.id("ContentPlaceHolder1_WachtwoordTextBox")).clear();
dw2.findElement(By.id("ContentPlaceHolder1_WachtwoordTextBox")).sendKeys("fiet$hok");
//Login : Clcik on Login button
dw2.findElement(By.id("ContentPlaceHolder1_LoginButton")).click();
//Click on Select button. After that new window will open
dw2.findElement(By.id("ContentPlaceHolder1_CWDatumRadioButton")).click();
// Below code I written to get the window handles
Set<String> AllWindowHandles = dw2.getWindowHandles();
String window1 = (String) AllWindowHandles.toArray()[0];
System.out.print("window1 handle code = "+AllWindowHandles.toArray()[0]);
String window2 = (String) AllWindowHandles.toArray()[1];
System.out.print("\nwindow2 handle code = "+AllWindowHandles.toArray()[1]);
//Switch to window2(child window) and performing actions on it.
dw2.switchTo().window(window2);
//Click the user
dw2.findElement(By.id("AfdelingGebruikersListView_RowCheckBox_8")).click();
//Click on OK button after selecting User
dw2.findElement(By.id("AfdelingGebruikersListView_OKButton")).click();
//Switch to window1(child window) and performing actions on it.
dw2.switchTo().window(window1);
//Click the order type you want to retrieve
dw2.findElement(By.id("ContentPlaceHolder1_VerwerktRadioButton")).click();
//Click for exporting the data to Excel Sheet
dw2.findElement(By.id("ContentPlaceHolder1_ExporteerNaarExcelButton")).click();
}

Answer 1

U can switch to windows using:
for (String winHandle : objDriver.getWindowHandles()) {
objDriver.switchTo().window(winHandle);
}
This will switch to the last window opened. To get back to parent window by again using the above code. It would be better that u incorporate the code in a different method in order to reuse.
Hope this helps. Thanks.

Answer 2

Editing the Code as per the comment by OP :-
Since, as I suggested in comment, it might not be a new window. It must be a pop-up. So, please replace your code as below and try:
//Click on Select button. After that new window will open
dw2.findElement(By.id("ContentPlaceHolder1_CWDatumRadioButton")).click()
//Click the user
try{
WebDriverWait wait = new WebDriverWait(dw2,20);
WebElement ele = wait.until(ExpectedConditions.visibilityOfElementLocated(By.id("AfdelingGebruikersListView_RowCheckBox_8")));
ele.click();
}catch(Throwable e){
System.err.println("Error while clicking on the element. "+e.getMessage());
}
//Click on OK button after selecting User
dw2.findElement(By.id("AfdelingGebruikersListView_OKButton")).click();