if click a childnode in a treeview i need to go another form in c# windows application

private void Form1_Load(object sender, EventArgs e)
       {
           PopulateTreeView();
           this.treeView1.DoubleClick += new EventHandler(treeView1_DoubleClick);
       }
       private void treeView1_DoubleClick(object sender, EventArgs e)
       {
           TreeView tView = (TreeView)sender;
           switch (tView.SelectedNode.Text)
           {
               case "Dog":
                   MessageBox.Show("Open the window related to Dog");
                   break;
               case "Cat":
                   MessageBox.Show("Open the window related to Cat");
                   break;
               case "Monkey":
                   MessageBox.Show("Open the window related to Monkey");
                   break;
           }
       }