For doing this the MdiParent property for the new child has to be set from another child form. Please refer the below code snippet which illustrates this:
private void buttonAdv1_Click(object sender, EventArgs e)
Form3 child1 = new Form3();
// Set the new form's MDI parent to main form
child1.MdiParent = (Form1)this.Parent.Parent;
child1.Text = "Document";
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim f1 As Form3 = New Form3()
' Set the new form's MDI parent to main form
f1.MdiParent = CType(Me.Parent.Parent, Form1)
f1.Text = "Document"
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