Automatic closing of child windows.

Please tell me, I can't win this small problem.
I have a window open with the command -
loadusr -Wn RightPan gladevcp -g +10+10 -c RightPan -H RightPan.hal RightPan.ui
How to write this command correctly so that the window closes when the LCNC is closed?
Now, when closing the LCNC window, all child windows launched using the loadusr command remain open. Already perverted in every way, to no avail.
Thank you.