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Finally, I solved this problem i was doing Window imgWindow = new ImageWindow(); instead of var imgWindow = new ImageWindow();


Maybe that will help someone else in the future.

It's the same question as this guy asked http://stackoverflow.com/questions/2219097/how-can-i-access-one-windows-control-richtextbox-from-another-window-in-wpf

But none of the solutions given...

I have a program that has to WPF Windows.

In the first MainWindow I have a menu to open a an image file.

The menu opens an OpenDialog box to let the user choose an image, after the image is...