// create the appearance of the normal thumbnail
Vintasoft.Imaging.UI.ThumbnailAppearance thumbnailAppearance = 
    new Vintasoft.Imaging.UI.ThumbnailAppearance();
thumbnailAppearance.BackColor = 
    System.Drawing.Color.FromArgb(32, System.Drawing.Color.Blue);
thumbnailViewer.ThumbnailAppearance = thumbnailAppearance;

// create the appearance of the focused thumbnail
Vintasoft.Imaging.UI.ThumbnailAppearance focusedThumbnailAppearance = 
    new Vintasoft.Imaging.UI.ThumbnailAppearance();
focusedThumbnailAppearance.BackColor = 
    System.Drawing.Color.FromArgb(32, System.Drawing.Color.Green);
focusedThumbnailAppearance.BorderColor = System.Drawing.Color.Red;
focusedThumbnailAppearance.BorderStyle = System.Windows.Forms.ButtonBorderStyle.Dotted;
focusedThumbnailAppearance.BorderWidth = 1;
thumbnailViewer.FocusedThumbnailAppearance = focusedThumbnailAppearance;

// create the appearance of the hovered thumbnail
Vintasoft.Imaging.UI.ThumbnailAppearance hoveredThumbnailAppearance = 
    new Vintasoft.Imaging.UI.ThumbnailAppearance();
hoveredThumbnailAppearance.BackColor = 
    System.Drawing.Color.FromArgb(32, System.Drawing.Color.Orange);
hoveredThumbnailAppearance.BorderStyle = System.Windows.Forms.ButtonBorderStyle.Inset;
hoveredThumbnailAppearance.BorderWidth = 2;
thumbnailViewer.HoveredThumbnailAppearance = hoveredThumbnailAppearance;

// create the appearance of the selected thumbnail
Vintasoft.Imaging.UI.ThumbnailAppearance selectedThumbnailAppearance = 
    new Vintasoft.Imaging.UI.ThumbnailAppearance();
selectedThumbnailAppearance.BorderColor = System.Drawing.Color.Yellow;
selectedThumbnailAppearance.BorderStyle = System.Windows.Forms.ButtonBorderStyle.Dashed;
selectedThumbnailAppearance.BorderWidth = 2;
thumbnailViewer.SelectedThumbnailAppearance = selectedThumbnailAppearance;

// create the appearance of the not ready thumbnail
Vintasoft.Imaging.UI.ThumbnailAppearance notReadyThumbnailAppearance = new Vintasoft.Imaging.UI.ThumbnailAppearance();
notReadyThumbnailAppearance.BackColor = System.Drawing.Color.Black;
thumbnailViewer.NotReadyThumbnailAppearance = notReadyThumbnailAppearance;

' create the appearance of the normal thumbnail
Dim thumbnailAppearance As New Vintasoft.Imaging.UI.ThumbnailAppearance()
thumbnailAppearance.BackColor = System.Drawing.Color.FromArgb(32, System.Drawing.Color.Blue)
thumbnailViewer.ThumbnailAppearance = thumbnailAppearance

' create the appearance of the focused thumbnail
Dim focusedThumbnailAppearance As New Vintasoft.Imaging.UI.ThumbnailAppearance()
focusedThumbnailAppearance.BackColor = System.Drawing.Color.FromArgb(32, System.Drawing.Color.Green)
focusedThumbnailAppearance.BorderColor = System.Drawing.Color.Red
focusedThumbnailAppearance.BorderStyle = System.Windows.Forms.ButtonBorderStyle.Dotted
focusedThumbnailAppearance.BorderWidth = 1
thumbnailViewer.FocusedThumbnailAppearance = focusedThumbnailAppearance

' create the appearance of the hovered thumbnail
Dim hoveredThumbnailAppearance As New Vintasoft.Imaging.UI.ThumbnailAppearance()
hoveredThumbnailAppearance.BackColor = System.Drawing.Color.FromArgb(32, System.Drawing.Color.Orange)
hoveredThumbnailAppearance.BorderStyle = System.Windows.Forms.ButtonBorderStyle.Inset
hoveredThumbnailAppearance.BorderWidth = 2
thumbnailViewer.HoveredThumbnailAppearance = hoveredThumbnailAppearance

' create the appearance of the selected thumbnail
Dim selectedThumbnailAppearance As New Vintasoft.Imaging.UI.ThumbnailAppearance()
selectedThumbnailAppearance.BorderColor = System.Drawing.Color.Yellow
selectedThumbnailAppearance.BorderStyle = System.Windows.Forms.ButtonBorderStyle.Dashed
selectedThumbnailAppearance.BorderWidth = 2
thumbnailViewer.SelectedThumbnailAppearance = selectedThumbnailAppearance

' create the appearance of the not ready thumbnail
Dim notReadyThumbnailAppearance As New Vintasoft.Imaging.UI.ThumbnailAppearance()
notReadyThumbnailAppearance.BackColor = System.Drawing.Color.Black
thumbnailViewer.NotReadyThumbnailAppearance = notReadyThumbnailAppearance