ToolTip.Show for an inactive window does not work

Question

Why is the tooltip displayed manually with the help ToolTip.Shownot displayed when the window containing the control is inactive?

public class MyControl : Button
{

    private _tip;
    public string ToolTip
    {
        get { return _tip; }
        set { _tip = value; }
    }

    private ToolTip _toolTip = new ToolTip();

    public MyControl()
    {
        _toolTip.UseAnimation = false;
        _toolTip.UseFading = false;
        _toolTip.ShowAlways = true;
    }

    protected override void OnMouseHover(EventArgs e)
    {
        _toolTip.Show(_tip, this, 0, Height);
        base.OnMouseHover(e);
    }

    protected override void OnMouseLeave(EventArgs e)
    {
        _toolTip.Hide(this);
        base.OnMouseLeave(e);
    }
}

I went on ToolTip.Showbecause I have to have a tooltip on the screen for an unlimited time, which is impossible when using the usual one ToolTip. I also like the idea of ​​having tooltip text as part of the management itself. But unfortunately, when showing a tooltip for an inactive window (despite ShowAlways = true), it just doesn't work.

The event is OnMouseHowerhighlighted, but _toolTip.Showdoes nothing .. if the window is not activated, then everything works.

Bounty

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Answer 1

, , , , :

using System.Reflection;

public class MyControl : Button {
  private ToolTip toolTip = new ToolTip() {
    UseAnimation = false,
    UseFading = false
  };

  public string ToolTip { get; set; }

  protected override void OnMouseHover(EventArgs e) {
    base.OnMouseHover(e);
    Point mouse = MousePosition;
    mouse.Offset(10, 10);
    MethodInfo m = toolTip.GetType().GetMethod("SetTool",
                           BindingFlags.Instance | BindingFlags.NonPublic);
    m.Invoke(toolTip, new object[] { this, this.ToolTip, 2, mouse });
  }

  protected override void OnMouseLeave(EventArgs e) {
    base.OnMouseLeave(e);
    toolTip.Hide(this);
  }
}

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