WPF TextBox's IsInactiveSelectionHighlightEnabled property is not work?

Question

WPF's TextBox has a property named IsInactiveSelectionHighlightEnabled. I set this property to true in order to make a TextBox always show selection. However, it doesn't work in this case:

    private void button_Click(object sender, RoutedEventArgs e) {
        textBox.Select(0, 10);
    }

I just want to see the selection after clicking the button. But selection will not appear until I right click the TextBox. Why? Am I miss something?

Answer 1

You should have the Keyboard focus on your textbox to select the text in it.

Add this code to your button click event before the selection.

Keyboard.Focus(textBox);  

Hope it helps.