Checkbox Example for an Extended Message Box

ExtendedMessageBoxCheckboxSample.cs

ExtendedDialogResult LobjResult = ExtendedMessageBox.Show("Hello World - Are you ok?", 
                                                          "The Office Context", 
                                                          MessageBoxButtons.OKCancel,
                                                          MessageBoxIcon.Information,
                                                          "Do not show this message again.");
if(LobjResult.Result == DialogResult.OK && LobjResult.IsChecked)
{
    // do something
}