Windows Forms ToolTip will not re-appear after first use

Question

I have a Windows Forms C# application where I would like to use a tooltip on one of the text boxes. I initialize the tool-tip in the constructor of the Form class, and it wo

Answer 1

I had a similar problem today. VS 2010 SP1 .Net 3.5
After AutoPopDelay-Time the ToolTip do not show the Controls ToolTipText.
Kevins solution is the only way to solve the problem.

I encapsulate this in my own ToolTip class:

public class ToolTip : System.Windows.Forms.ToolTip 
{
    public ToolTip() : base() { }

    public ToolTip(System.ComponentModel.IContainer components) : base(components) { }

    public new void SetToolTip(System.Windows.Forms.Control ctl, string caption) 
    {
        ctl.MouseEnter -= new System.EventHandler(toolTip_MouseEnter);
        base.SetToolTip(ctl, caption);
        if(caption != string.Empty)
        ctl.MouseEnter += new System.EventHandler(toolTip_MouseEnter);
    }

    private void toolTip_MouseEnter(object sender, EventArgs e) 
    {
        this.Active = false;
        this.Active = true;
    }
}