C#

public class NewView : TreeView
{
    private bool mAllowJumpToNode = false;

    public bool AllowJumpToNode
    {
        get
        {
            return mAllowJumpToNode;
        }
        set
        {
            mAllowJumpToNode = value;
        }
    }

    public NewView()
    {

    }

    public NewView(IContainer container) : this()
    {
        container.Add(this);
    }

    protected override void WndProc(ref Message m)
    {
        //If jumping to nodes by pressing a key is not allowed
        if (!mAllowJumpToNode)
        {
            //Ignores WM_KEYDOWN, WM_KEYPRESS, WM_KEYUP
            if (m.Msg < 0x0100 || m.Msg > 0x0102)
            {
                base.WndProc(ref m);
            }
        }
        else //otherwise
        {
            //process all windows messages normally
            base.WndProc(ref m);
        }
    }
}

George L. Jackson wrote:

Many programmers don't advise using a message pump in a Windows Serivce