Question

I have an application with a tab control and several textboxes in each tab and when the user says so, I would like every text box in the window (called MainWindow) to be cleared. I used the method described here, but it only seems to work for the textboxes in the tab that it is in focus.

Answer 1

Try this:

void ClearTextBoxes(DependencyObject obj)
{
    TextBox tb = obj as TextBox;
    if (tb != null)
        tb.Text = "";

    for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj as DependencyObject); i++)
        ClearTextBoxes(VisualTreeHelper.GetChild(obj, i));
}

private void Button_Click(object sender, RoutedEventArgs e)
{
    ClearTextBoxes(this);
}