Wix doesn't remove previous version of burn exe during major upgrade

Question

I have created a wix exe using burn bootstrapper. When I try to do a major upgrade on it, the new version gets installed. The features missing in the new upgrade are also remove

Answer 1

I found the solution atlast. I had to hook onto the DetectComplete method and call the plan method on the Engine. Below is how I did it.

void DetectComplete(object sender, DetectCompleteEventArgs e)
    {
        Bootstrapper.Engine.Log(LogLevel.Verbose,"fired! but does that give you any clue?! idiot!");
        if (LaunchAction.Uninstall == Bootstrapper.Command.Action)
        {
            Bootstrapper.Engine.Log(LogLevel.Verbose, "Invoking automatic plan for uninstall");
            Bootstrapper.Engine.Plan(LaunchAction.Uninstall);
        } 
    }