You can detect when a user Clicked on a HelpButton
on title-bar of form by handling HelpButtonClicked
. You can let the event continue or cancel it by setting Cancel
property of its event args to true
.
private void Form1_HelpButtonClicked(object sender, CancelEventArgs e)
{
e.Cancel = true;
//Perform some custom action
MessageBox.Show("Some Custom Help");
}