button window is not displayed on common dialog

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C#

Hi,

I created button window on common dialog using API "CreateWindowEx" , it is created successfully.
PageSetupDialog object created and called ShowDialog() function.
from other thread I call method which is creating button window using following syntax.
I used following syntax:
IntPtr childwind = CreateWindowEx(WindowStylesEx.WS_EX_LEFT, "BUTTON", "Print",
WindowStyles.WS_VISIBLE | WindowStyles.WS_CHILD,

0, 0, width, height, hwnd, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero);

I checked using GetChildwindow and window count is increase by one , but button window is not displayed on dialog.

I am missing any important step ? Please let me know solution for same.

Additional Info:
when I use same syntax and add window to Form , it is working fine.

Edit: Code from answer moved here
Hi SAKryukov,

I am sharing my code with you.

 public partial class Form1 : Form
 {
 [DllImport("user32.dll", SetLastError = true)]
 public static extern IntPtr FindWindow(string strClassName, string strWindowName);

 [DllImport("user32.dll", SetLastError = true)]
 static extern IntPtr CreateWindowEx(
 WindowStylesEx dwExStyle,
 string lpClassName,
 string lpWindowName,
 WindowStyles dwStyle,
 int x,
 int y,
 int nWidth,
 int nHeight,
 IntPtr hWndParent,
 IntPtr hMenu,
 IntPtr hInstance,
 IntPtr lpParam);

 [DllImport("user32.dll", SetLastError = true)]
 static extern int ShowWindow(IntPtr Hwnd, int iCmdShow);
  
 [DllImport("user32.dll", SetLastError = true)]
 static extern bool UpdateWindow(IntPtr hWnd);

 Thread mythread;
 PageSetupDialog dlg;

 public Form1()
 {
 InitializeComponent();
 dlg = new PageSetupDialog(); 
}
  
 private void button1_Click(object sender, EventArgs e)
 {
 dlg.Document = new System.Drawing.Printing.PrintDocument();
 mythread = new Thread(new ThreadStart(TestMethod));
 mythread.Start();
 dlg.ShowDialog();
 }
  
 void TestMethod()
 {
  
 IntPtr hWndPageSetup = FindWindow(null, dlg.ToString());
 Boolean finPageSetupHandle = false;
 while (!finPageSetupHandle && hWndPageSetup == IntPtr.Zero)
 {
 System.Threading.Thread.Sleep(500);
 hWndPageSetup = FindWindow(null, "Page Setup");
 finPageSetupHandle = true;
 }

 IntPtr childwind = CreateWindowEx(WindowStylesEx.WS_EX_LEFT, "BUTTON", "Print",
 WindowStyles.WS_VISIBLE | WindowStyles.WS_CHILD,
  
 0, 0, 50, 50, hWndPageSetup, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero);
  
 ShowWindow(childwind, 1);
 UpdateWindow(childwind); 
} 
}