private void SiteBorder_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
_resizing = false;
SiteBorder.ReleaseMouseCapture();
}
private void SiteBorder_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
_resizing = true;
SiteBorder.CaptureMouse();
e.Handled = true;
}
