Hover form over label... keeps flashing

[C# Programming]

I am trying to show a small form when you hover over this label. A image is on this form and thats it (form is borderless). When you hover over the label it comes up, when you move the mouse left or right or up or down it moves with it. Problem is it keeps flashing! What am I doing wrong?


private void lbSig_MouseEnter(object sender, EventArgs e)
{
sigForm.******** = new Point(Cursor.Position.X, Cursor.Position.Y);
sigForm.Show();
}

private void lbSig_MouseLeave(object sender, EventArgs e)
{
sigForm.Hide();
}

private void lbSig_MouseMove(object sender, MouseEventArgs e)
{
sigForm.******** = Cursor.Position;
}