添加到TabPage的MDIChild用户控件的焦点

亲爱的所有人，

我正在尝试找到一种在MDI父项的TabControl内使用MDI子项(恰好是用户控件)的方法.我可以使用...将用户控件的多个实例放到选项卡上.

Dear all,

I''m trying to find a way of using an MDI Child (which happens to be a user control) within a TabControl on the MDI Parent. I am able to put several instances of the user control onto a tab using...

Form NumForm = new NumericalViewer();
NumForm.TopLevel = false;
NumForm.MdiParent = this;           
NumForm.Show();
tc_main.SelectedTab.Controls.Add(NumForm);
NumForm.BringToFront();

每次在父窗体上按下按钮以将数字查看器的新实例显示在屏幕上时，都会调用上述代码段.此控件具有标准的可调整大小"边框.

添加新实例时，它总是最后添加的一个实例，其边框显示该实例具有焦点.所有其他都被取消选择.我可以选择任何其他实例，但是它们永远不会显示出它们具有焦点.我什至尝试添加此内容...

The above snippet is called every time a button is pressed on the parent form to bring a new instance of the numerical viewer onto the screen. This control has a standard ''Sizeable'' border.

When you add a new instance, its always the last one added whose border shows that instance has the focus. All the others become deselected. I can select any of the other instances, but they never show as though they have the focus. I''ve even tried adding this...

protected override void DefWndProc(ref Message m)
{
    const long WM_NCLBUTTONDOWN = 0xA1;
    if (m.Msg == WM_NCLBUTTONDOWN)
    {
        this.Activate();
        datalist.Select();
    }
    base.DefWndProc(ref m);
}

(数据列表是表单上的控件)，以识别何时单击了标题栏.这样会将实例置于最前面，但似乎没有使其具有焦点，并且标题栏保持为未选定"颜色.

在其他所有方式中，代码的行为均应如预期.每个实例都有自己的数据，它会按预期显示和更新.

是否允许将MDI表单放入这样的容器控件中?我应该在寻找替代解决方案吗?还是我只是缺少一些真正明显的东西.

我应该补充一点，我已经看了与TabControl和MDI相关的有关codeproject的许多文章-请注意，我不希望每个用户控件都成为其自己的选项卡-我想拥有该控件的多个实例每个标签-希望清晰明了且有意义.

感谢您提供的建议和时间.

Aero

(datalist being a control on the form) to recognise when a titlebar has been clicked on. This brings the instance to the front but does not appear to give it focus, and the titlebar stays the "unselected" colour.

In every other way, the code behaves as it should. Each instance has its own data it which it displays and updates as intended.

Are you allowed to drop MDI forms into container controls like this? Should I be looking at an alternative solution? Or am I just missing something really obvious.

I should add that I have looked at a number of the articles on codeproject associated with the TabControl and MDI - note here that I don''t want each user control to be its own tab - I would like to have multiple instances of the control per tab - hope that''s clear and makes sense.

Thanks for any advice and time you can give.

Aero