How to insert UserControl into TabPage in .NET5 WPF ?

Question

Hi,
I need to insert a UserControl onto a TabPage on a main form but it does not work for me.
I have .NET5 WPF project in MS VS 2019 v 16.9.4.
Can someone help me ? Here is my source code:

https://drive.google.com/file/d/1YACmuMXhZllATRnld901q6vDzK9iU0JE/view?usp=sharing

The command <app:ProcessView /> does not work and shows me this error:

Severity Code Description Project File Line Suppression State
Error XDG0008 The name "UserControl1" does not exist in the namespace "clr-namespace:WpfApp". WpfApp c:\1\WpfApp4 TabControl\WpfApp\WpfApp\MainWindow.xaml 12

thanks Jerry

Answer 1

Try rebuilding the solution using Build, Rebuild Solution menu command. Close and reopen the designers.

Answer 2

wooooou it is working ok... :) thanks

and by the way, do you know how to insert it dynamically based on "code behind" ???

Answer 3

thank you ... :)
j.