Problem with checkedListBox + drag-n-drop

Question

Good morning, I have a problem with the component checkedListBox of my application C# Windows Form. In the following code I am using drag n drop to reorder items from checkedListBox, what is working correctly. However I cannot mark how check in no item. I think the problem is in the event MouseDown but I can’t fix it. Someone can help me with this problem?

EDIT: code updated and working correctly.

using System;
using System.Drawing;
using System.Windows.Forms;

namespace projetodetestes
{
public partial class testeeacelerometro : Form
{
    public testeeacelerometro()
    {
        InitializeComponent();
    }

    bool teste_checked = false;

    private void testeeacelerometro_Load(object sender, EventArgs e)
    {
        checkedListBox1.AllowDrop = true;
        checkedListBox1.CheckOnClick = true;
    }

    private void checkedListBox1_DragDrop(object sender, DragEventArgs e)
    {
        Point point = checkedListBox1.PointToClient(new Point(e.X, e.Y));
        int index = this.checkedListBox1.IndexFromPoint(point);
        if (index < 0) index = this.checkedListBox1.Items.Count - 1;
        object data = this.checkedListBox1.SelectedItem;
        this.checkedListBox1.Items.Remove(data);
        this.checkedListBox1.Items.Insert(index, data);
        if (teste_checked == true) checkedListBox1.SetItemChecked(index, true);
        else return;
    }

    private void checkedListBox1_DragOver(object sender, DragEventArgs e)
    {
        e.Effect = DragDropEffects.Move;
    }

    private void checkedListBox1_MouseMove(object sender, MouseEventArgs e)
    {
        if (this.checkedListBox1.SelectedItem != null && e.Button == MouseButtons.Left)
        {
            int index = checkedListBox1.SelectedIndex;
            if (checkedListBox1.GetItemChecked(index)) teste_checked = true;
            this.checkedListBox1.DoDragDrop(this.checkedListBox1.SelectedItem, DragDropEffects.Move);            
        }
    }
}
}

Answer 1

Unfortunately there are not many solutions. There is a gambiarra that works partially.

Remove the event MouseDown and enter the event MouseMove in this way:

private void checkedListBox1_MouseMove(object sender, MouseEventArgs e)
{
    if (this.checkedListBox1.SelectedItem != null && e.Button == MouseButtons.Left)
        this.checkedListBox1.DoDragDrop(this.checkedListBox1.SelectedItem, DragDropEffects.Move);
}

Edit: I say it works partially, because any mouse drive (with the left button pressed) already activates the DragDrop.