private void ObjectAnnotater_FormClosing(object sender, FormClosingEventArgs e)
{
if (btnSave.Enabled) //is modified
{
var result = MessageBox.Show("Do you want to save current changes ?", "Save annotations", MessageBoxButtons.YesNo, MessageBoxIcon.Information);
if (result == System.Windows.Forms.DialogResult.Yes)
{
saveToFile();
}
}
drawingManager.Dispose();
}
