vb.net- mouseEnter and MouseLeave event not working

Question

Here's the image and the code.....but, it is not working for me. Experts, please tell where's the error???

the image is here: https://drive.google.com/open?id=1rUBq68ULDkTiFFv2uEiV_oQIh3wQIfhd

Private Sub PanelHome_MouseEnter(sender As Object, e As EventArgs) Handles PanelHome.MouseEnter
    PanelHome.BackColor = Color.FromArgb(100, 25, 181, 254)
End Sub

Private Sub PanelHome_MouseLeave(sender As Object, e As EventArgs) Handles PanelHome.MouseLeave
    PanelHome.BackColor = Color.FromArgb(255, 25, 181, 254)
End Sub

Private Sub PanelTuner_MouseEnter(sender As Object, e As EventArgs) Handles PanelTuner.MouseEnter
    PanelTuner.BackColor = Color.FromArgb(50, 25, 181, 254)
End Sub

Private Sub PanelTuner_MouseLeave(sender As Object, e As EventArgs) Handles PanelTuner.MouseLeave
    PanelTuner.BackColor = Color.FromArgb(255, 25, 181, 254)
End Sub

Private Sub PanelContents_MouseEnter(sender As Object, e As EventArgs) Handles PanelContents.MouseEnter
    PanelContents.BackColor = Color.FromArgb(50, 25, 181, 254)
End Sub

Private Sub PanelContents_MouseLeave(sender As Object, e As EventArgs) Handles PanelContents.MouseLeave
    PanelContents.BackColor = Color.FromArgb(255, 25, 181, 254)
End Sub

Private Sub PanelAboutUs_MouseEnter(sender As Object, e As EventArgs) Handles PanelAboutUs.MouseEnter
    PanelAboutUs.BackColor = Color.FromArgb(50, 25, 181, 254)
End Sub

Private Sub PanelAboutUs_MouseLeave(sender As Object, e As EventArgs) Handles PanelAboutUs.MouseLeave
    PanelAboutUs.BackColor = Color.FromArgb(255, 25, 181, 254)
End Sub

Private Sub PanelWriteToUs_MouseEnter(sender As Object, e As EventArgs) Handles PanelWriteToUs.MouseEnter
    PanelWriteToUs.BackColor = Color.FromArgb(50, 25, 181, 254)
End Sub

Private Sub PanelWriteToUs_MouseLeave(sender As Object, e As EventArgs) Handles PanelWriteToUs.MouseLeave
    PanelWriteToUs.BackColor = Color.FromArgb(255, 25, 181, 254)
End Sub

Edit1: The panel's dock is set to fill....

Answer 1

Even if the panel's dock is Fill, your code works for me... I think you should try to isolate the problem. If I create a form with 2 panels, one Docked to TOP, and the other Docked to FILL, your code works for me, using the events MouseEnter and MouseLeave... Your problem is not the dock property, and is not the events used.

If you still cannot find the problem, you could start with a new Form and adding the code step by step until you find the step that make your program to stop working.