winform TabControl选项卡不可用

页面加载，第二个选项卡不可用，页面上进行操作后单击按钮才可跳转到下一个选项卡，并且不可返回上一个选项卡（这是什么需求我滴龟龟）

由于winform不自带某个TabPage不可用的属性，所以模拟了一下这个功能（客户需求没办法）。

或者也可以假装两个按钮再加上Panel的 

private void DlgRVTaskRun_Load(object sender, EventArgs e)
{
    //绘制选项卡
    tcContainer.DrawMode = TabDrawMode.OwnerDrawFixed;
    tcContainer.DrawItem += tcContainer_DrawItem;
}
/// <summary>
/// [保存]按钮单击事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnSave_Click(object sender, EventArgs e)
{
    tcContainer.Tag = true;
    tcContainer.SelectedTab = tcContainer.TabPages[1];
}
/// <summary>
/// 选项卡[选择]事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void tcContainer_Selecting(object sender, TabControlCancelEventArgs e)
{
    if ((tcContainer.SelectedTab.Name == tcContainer.TabPages[1].Name && !(tcContainer.Tag is bool)) || tcContainer.SelectedTab.Name == tcContainer.TabPages[0].Name )
    {
        e.Cancel = true;
    }
}

/// <summary>
/// 绘制选项卡
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void tcContainer_DrawItem(object sender, DrawItemEventArgs e)
{

    Rectangle recLeft = tcContainer.GetTabRect(0);
    Rectangle recRight = tcContainer.GetTabRect(1);
    //标签背景填充颜色
    SolidBrush BackBrush = new SolidBrush(Color.LightGray);
    //标签文字填充颜色
    SolidBrush FrontBrush = new SolidBrush(Color.Black);
    //设置文字对齐方式 
    StringFormat StringF = new StringFormat() { Alignment = StringAlignment.Center, LineAlignment = StringAlignment.Center };
    if (tcContainer.Tag is bool)
    {
        e.Graphics.FillRectangle(BackBrush, recLeft);
        e.Graphics.DrawString(tcContainer.TabPages[0].Text, new Font("微软雅黑", 10.5F), FrontBrush, recLeft, StringF);
        e.Graphics.DrawString(tcContainer.TabPages[1].Text, new Font("微软雅黑", 10.5F), FrontBrush, recRight, StringF);
    }
    else
    {               
        e.Graphics.FillRectangle(BackBrush, recRight);
        e.Graphics.DrawString(tcContainer.TabPages[0].Text, new Font("微软雅黑", 10.5F), FrontBrush, recLeft, StringF);
        e.Graphics.DrawString(tcContainer.TabPages[1].Text, new Font("微软雅黑", 10.5F), FrontBrush, recRight, StringF);
    }
}