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private void MainText_SizeChanged(object sender, SizeChangedEventArgs e)
{
TextBox ChangedTextBox = (TextBox)sender;
if (ChangedTextBox.IsFocused)
{
FocusBorder.Margin = ChangedTextBox.Margin;
FocusBorder.Width = ChangedTextBox.ActualWidth;
FocusBorder.Height = ChangedTextBox.ActualHeight;
}
}