[mrnooo2000]

الأمر لا يحتاج الى مكتبات يمكنك أن تصنع أدواتك بنفسك 

هذا Label يعطيك ما تريد 

كود :

Class MyLabel
   Inherits Label
   Private HooverBackColor As Color
   Private HooverTextColor As Color
   Private HooverBorderColor As Color
   Private Shape As Drawing2D.GraphicsPath

   Sub New()
       Font = New System.Drawing.Font("Segoe UI", 8)
       ForeColor = Color.FromArgb(142, 142, 142)
       BackColor = Color.Transparent
       HooverBackColor = Color.LightBlue
       HooverTextColor = Color.White
       HooverBorderColor = Color.White
   End Sub
   Protected Overrides Sub OnMouseEnter(ByVal e As System.EventArgs)
       MyBase.OnMouseEnter(e)

       Shape = New Drawing2D.GraphicsPath
       With Shape
           .AddArc(0, 0, 10, 10, 180, 90)
           .AddArc(Width - 11, 0, 10, 10, -90, 90)
           .AddArc(Width - 11, Height - 11, 10, 10, 0, 90)
           .AddArc(0, Height - 11, 10, 10, 90, 90)
           .CloseAllFigures()
       End With

       Using Bmp As New Bitmap(Width, Height)
           Using G = Graphics.FromImage(Bmp)
               G.SmoothingMode = Drawing2D.SmoothingMode.HighQuality
               G.Clear(Color.Transparent) ' Set control background to transparent
               Using Backbrush As New SolidBrush(HooverBackColor)
                   G.FillPath(Backbrush, Shape) ' Draw RTB background
               End Using
               Using BorderPen As New Pen(HooverBorderColor)
                   G.DrawPath(BorderPen, Shape) ' Draw border
               End Using
               Dim F As New Font(Me.Font, FontStyle.Bold)
               Dim Format As StringFormat = New StringFormat() With {.LineAlignment = StringAlignment.Center, .Alignment = StringAlignment.Center}
               Using Textbrush As New SolidBrush(HooverTextColor)
                   G.DrawString(Me.Text, F, Textbrush, ClientRectangle, Format)
               End Using
               Using GF = Me.CreateGraphics
                   GF.DrawImage(Bmp.Clone(), 0, 0)
               End Using
           End Using
       End Using

   End Sub
   Protected Overrides Sub OnMouseLeave(ByVal e As System.EventArgs)
       MyBase.OnMouseLeave(e)
       Me.Refresh()
   End Sub

End Class

ضع الكود فى كلاس  ثم Build
بعد ذلك يمكنك اضافته لديك كأى كونترول عادى