private void openPreferencesModelessly_Click(object sender, EventArgs e)
{
bool formOpen = false;
foreach (Form form in Application.OpenForms)
if (form is PreferencesDialog)
formOpen = true;
if (!formOpen)
{
PreferencesDialog dlg = new PreferencesDialog();
dlg.Show(this);
}
else
MessageBox.Show("Error: Cannot open. A Preferences dialog is already open.");
}
