public static CalculationsWindow GetInstance()
{
if (instance == null)
{
instance = new CalculationsWindow();
}
return(instance);
}
//window closing event handler
private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
instance = null;
}
private void Image_PreviewMouseDown(object sender, MouseButtonEventArgs e)
{
CalculationsWindow.GetInstance().Show();
CalculationsWindow.GetInstance().Activate();
}