((Page1)frame1.Content).TextBox1.Text = "Hello, World";
But it's best to use a class, and binding the textbox.
Pregunta
I have a wpf application with a ribbon. I want to change Textboxes from another page displayed inside a frame under my ribbon. And I want to do it from a RibbonButton. Is it possible?
Solución
((Page1)frame1.Content).TextBox1.Text = "Hello, World";
But it's best to use a class, and binding the textbox.