private void RichTextBox1_KeyPress(object sender, KeyPressEventArgs e) { Point LocationCombo = new Point(); if (e.KeyChar == (char)'<') { LocationCombo = RichTextBox1.GetPositionFromCharIndex(RichTextBox1.SelectionStart); LocationCombo.Y = LocationCombo.Y + RichTextBox1.Font.Height + 3; ComboBox1.Location = LocationCombo; ComboBox1.Visible = true; ComboBox1.DroppedDown = true; ComboBox1.Focus(); } }