host win32 window in Winui3 but win32 window cover winui3 DialogContent

[501586528]

Describe the bug

I have a win32 application, there is a mainwindow. I have a win32 window, I want to host win32 window in winu3.
Firstly I get HWND of mainWindow.
in MainWindow.xamlcs
WinRT.Interop.WindowNative.GetWindowHandle(this)
Then I pass HWND of mainWindow to win32 window. And I use method SetParent(),set MainWindow as Parent of win32 window.
SetParent(children, parent);
Finally win32 window show up successfully.
But when I want to show a DialogContent, win32 window will cover DialogContent.And it couldn't be clicked.

Steps to reproduce the bug

I just Click a button that show a DialogContent. It is coverd

Expected behavior

I want to show DialogContent before win32 window, what should I do?

Screenshots

NuGet package version

None

Windows version

No response

Additional context

No response