private void btnTopScores_Click(object sender, EventArgs e)
{
TopScoresChart topScoresChart = TopScoresChart.GetInstance();
topScoresChart.MdiParent = this;
topScoresChart.Show();
}
public static TopScoresChart GetInstance()
{
if (_instance == null)
{
_instance = new TopScoresChart();
}
return(_instance);
}
private void TopScoresChart_FormClosed(object sender, FormClosedEventArgs e)
{
_instance = null;
}