c# winFrom 使窗体显示SplitContainer或Panel中

private void menuStepAdd_Click(object sender, EventArgs e)
{
     frmAddStep addStep = new frmAddStep();
     addStep.FormBorderStyle = FormBorderStyle.None;
     addStep.TopLevel = false;
     splitMain.Panel2.Controls.Add(addStep);
     addStep.Show();
}

//"不显示"tabControl1的tabPage2
this.tabControl1.TabPages.Remove(tabPage2);