Apart from the fact you are confused I hardly see any problem in what you
tryed to achieve.
Not being sure of what is your problem exactly I wrote a a possible (and
possibly irrelevant) solution below.

class AnObject : Object
{
   bool done = false;
   public void DoSomethingOnce()
   {
         if(done)
           return;
       DoItDamnIt();
       done = false;
   }
   void DoItDamnIt()
   {
       // whatever it is you want to do
   }
}
class MyForm : Form
{
   AnObject anObj;
   Button perhaps, maybe;

   public MyForm(AbObject anObj)
   {
       this.anObj = anObj;

       perhaps = new Button();
       perhaps.Location = new Point(10, 10);
       perhaps.Parent = this;
       perhaps.Text = "Perhaps";
       perhaps.Click += delegate(object sender, EventArgs e) { new
MyForm(anObj).Show(); };

       maybe = new Button();
       maybe.Location = new Point(80, 10);
       maybe.Parent = this;
       maybe.Text = "Maybe";
       maybe.Click += delegate(object sender, EventArgs e) {
anObj.DoSomethingOnce(); };
   }
}