How to adjust size wpf parent window same as it's child window size

[hallatie]

hello,

I have an empty parent window, in runtime i add the child user control to it.

i want to resize my parent window according to the different child contents, i have used SizeToContent but it does not worked for me.

i add this child user control in a GridControl of my Parent window. Is it possible to resize main window according to child user control