How to get focus to main window after popup window is closed.

Hi guys,

I am working on the popup window. I am able to focus on the popup
window and can enter the values in to the text fields and save the
values. After saving the value i am closing the window by clicking the
close button.The main page has to refresh automatically when the popup
window close. But my application is stuck after the popup window is
closed and throwing a warning message.Please go through the code
below.

public void testUntitled() throws Exception {
selenium.open("/Login.aspx");
selenium.type("txtUsername", "Raju");
selenium.type("txtPassword", "Raju");
selenium.click("btnSubmit");
//selenium.waitForPageToLoad("30000");
selenium.type("ctl00_txtMemberID", "001620682");
selenium.click("ctl00_btnmasterSearch");
//selenium.waitForPageToLoad("30000");

selenium.click("ctl00_contentplaceholder1_uctMemberLedgerGrid1_btnNewLedger");
//selenium.waitForPopUp("form1", "30000");
String[] name = selenium.getAllWindowNames();
int name1 = name.length-1;
System.out.println("WindowName : " +selenium.getAllWindowNames()
[name1]);
selenium.selectWindow(selenium.getAllWindowNames()[name1]);
//selenium.selectWindow("Add New Service Note");

selenium.type("ctl09_txtAmount", "100");
//selenium.select("ctl09_ddlLedgerStatus", "label=Refund Credited");
selenium.select("ctl09_ddlLedgerStatus", "label=Paid Confirmed");
selenium.select("ctl09_ddlCommission", "label=Commissioned");
selenium.type("ctl09_txtComments", "Commissioned");
selenium.click("ctl09_btnSave");
selenium.click("ctl09_btnClose");
selenium.selectWindow(null);
//selenium.close();
//selenium.waitForPageToLoad("30000");



//selenium.waitForPageToLoad("30000");
}

Error:
20:41:42.727 INFO - Got result: OK on session
20afc51bf7f04464b4d8472a08ea6ec2
20:41:42.743 INFO - Command request: selectWindow[null, ] on session
20afc51bf7f04464b4d8472a08ea6ec2
20:41:42.759 WARN - Invalid length: Content-Length=21395 written=16384
for http://nextindapp01:9010/Popup.aspx

can you guys please help me how to handle this?

Thanks in advance.

Regards,
Raju.

did you try

selenium.selectWindow(selenium.getAllWindowNames()[name1-1]);

instead of

selenium.selectWindow(null)?