The click ,double click on mdi parent of the .net MDI form does not work is it a bug?
                +1 
                A: 
                
                
              Well, that's not much to go on without knowing exactly what you click on. The gray background of the parent is a separate control, an MdiClient, not the form. You'd register a click event for it with code like this:
    public Form1() {
        InitializeComponent();
        foreach (var ctl in this.Controls) {
            if (ctl is MdiClient) {
                (ctl as MdiClient).Click += Client_Click;
                break;
            }
        }
    }
    private void Client_Click(object sender, EventArgs e) {
        // etc...
    }
                  Hans Passant
                   2010-09-13 12:39:12
                
              Great answer Thanks, but quite surprising that I could not find it any where else,It also solves by another question as listed in  http://stackoverflow.com/questions/3698445/problem-with-controls-in-mdi-form/3706206#3706206
                  Thunder
                   2010-09-14 04:54:19