Private Sub RadButton2_Click(sender As Object, e As EventArgs) Handles RadButton2.Click
        Dim spreadExporter As GridViewSpreadExport = New GridViewSpreadExport(gvAssetSchedule)
        AddHandler spreadExporter.CellFormatting, AddressOf spreadExporter_CellFormatting
        Dim exportRenderer As New SpreadExportRenderer()
        spreadExporter.ExportVisualSettings = True
        Dim filename = "..\..\export" & DateTime.Now.ToLongTimeString().Replace(":", "_") & ".xlsx"
        spreadExporter.RunExport(filename, exportRenderer)
        Process.Start(filename)
    End Sub

    Private Sub spreadExporter_CellFormatting(sender As Object, e As Telerik.WinControls.Export.CellFormattingEventArgs)
        If e.GridCellInfo Is Nothing Then
            Dim selection As CellSelection = e.CellSelection
            Dim range As CellRange = selection.CellRanges(0)
            Dim val = selection.Worksheet.Cells(range.FromIndex.RowIndex, range.FromIndex.ColumnIndex).GetValue()
            Dim format As New CellValueFormat("@")
            selection.Worksheet.Cells(range.FromIndex.RowIndex, range.FromIndex.ColumnIndex).SetFormat(format)
            Dim dt As New DateTime(1900, 1, 1)
            Dim parsedDays = 0
            If Integer.TryParse(val.Value.RawValue, parsedDays) Then
                dt = dt.AddDays(parsedDays)
                selection.Worksheet.Cells(range.FromIndex.RowIndex, range.FromIndex.ColumnIndex).SetValue(dt.Year & "-" & MonthName(dt.Month))
            End If
        End If
    End Sub

this.radSyntaxEditor1.SyntaxEditorElement.EditorFontFamily = new Telerik.WinControls.SyntaxEditor.UI.FontFamily("Cascadia Code");
this.radSyntaxEditor1.SyntaxEditorElement.EditorFontSize = 13;

   at Telerik.WinControls.TelerikPaintHelper.GenerateSnapShotWithBitBlt(Control control)
   at Telerik.WinControls.UI.RadWaitingBar.AddBackgroundImageToAssociatedControlCoverPanel()
   at Telerik.WinControls.UI.RadWaitingBar.ShowCover()
   at Telerik.WinControls.UI.RadWaitingBar.StartWaiting()
   at TelerikWinFormsApp1.RadForm1.radButton1_Click(Object sender, EventArgs e) in C:\Projects\1564934_telerikwinformsapp1\TelerikWinFormsApp1\RadForm1.cs:line 31

        public class CustomWaitingBar : RadWaitingBar
        {
            protected override void AddBackgroundImageToAssociatedControlCoverPanel()
            {
                Size associatedControlSize = this.AssociatedControl.Size;
                if (associatedControlSize.Width <= 0 || associatedControlSize.Height <= 0)
                {
                    return;
                }

                Bitmap controlImage = new Bitmap(associatedControlSize.Width, associatedControlSize.Height);
                this.AssociatedControl.DrawToBitmap(controlImage, new Rectangle(Point.Empty, associatedControlSize));
                SolidBrush semiTransBrush = new SolidBrush(this.AssociatedControlCoverPanel.BackColor); // Color.FromArgb(128, 255, 255, 255) Default color
                Graphics g = Graphics.FromImage(controlImage);
                g.FillRectangle(semiTransBrush, new Rectangle(Point.Empty, controlImage.Size));
                this.AssociatedControlCoverPanel.BackgroundImage = controlImage;
            }

            public override string ThemeClassName
            {
                get
                {
                    return typeof(RadWaitingBar).FullName;
                }
            }
        }

StyleDefinition normalStyle = this.radRichTextEditor1.Document.StyleRepository[RadDocumentDefaultStyles.NormalWebStyleName];
normalStyle.ParagraphProperties.SpacingAfter = 20;
normalStyle.ParagraphProperties.SpacingBefore = 20;

        public RadForm1()
        {
            InitializeComponent();

                        // This XML contains a simple tree with a root node having 3 children, the first of which is intended to be Bold
            var xml = "<TreeView xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" MultiSelect=\"true\" AllowDragDrop=\"true\" LabelEdit=\"true\" AllowDrop=\"true\">  <Nodes Text=\"New Package\" Expanded=\"true\" ImageKey=\"Package\" Font=\"Microsoft Sans Serif, 8.25pt, style=Bold\">    <Tag xsi:type=\"xsd:string\">&lt;Info&gt;&lt;FullName&gt;\\New Package&lt;/FullName&gt;&lt;ObjectType&gt;Package&lt;/ObjectType&gt;&lt;IsRunnable&gt;False&lt;/IsRunnable&gt;&lt;IsContainer&gt;true&lt;/IsContainer&gt;&lt;/Info&gt;</Tag>    <Nodes Text=\"Query Engine\" ImageKey=\"QueryEngine\" Expanded=\"true\" Font=\"Microsoft Sans Serif, 8.25pt, style=Bold\">      <Tag xsi:type=\"xsd:string\">&lt;Info&gt;&lt;FullName&gt;\\Query Engine&lt;/FullName&gt;&lt;ObjectType&gt;QueryEngine&lt;/ObjectType&gt;&lt;IsRunnable&gt;true&lt;/IsRunnable&gt;&lt;IsTableEntity&gt;true&lt;/IsTableEntity&gt;&lt;IsCut&gt;false&lt;/IsCut&gt;&lt;/Info&gt;</Tag>    </Nodes>    <Nodes Text=\"Connector\" ImageKey=\"Irion.SQLServer\">      <Tag xsi:type=\"xsd:string\">&lt;Info&gt;&lt;FullName&gt;\\Connector&lt;/FullName&gt;&lt;ObjectType&gt;DBConnection&lt;/ObjectType&gt;&lt;IsCut&gt;false&lt;/IsCut&gt;&lt;/Info&gt;</Tag>    </Nodes>    <Nodes Text=\"Connector Link\" ImageKey=\"DatabaseDatalink\">      <Tag xsi:type=\"xsd:string\">&lt;Info&gt;&lt;FullName&gt;\\Connector Link&lt;/FullName&gt;&lt;ObjectType&gt;DatabaseDatalink&lt;/ObjectType&gt;&lt;IsRunnable&gt;true&lt;/IsRunnable&gt;&lt;IsTableEntity&gt;true&lt;/IsTableEntity&gt;&lt;IsCut&gt;false&lt;/IsCut&gt;&lt;/Info&gt;</Tag>    </Nodes>  </Nodes></TreeView>";

            this.radTreeView1.LoadXML(new MemoryStream(System.Text.Encoding.UTF8.GetBytes(xml)));

            //make sure that the following 2 nodes are bold:
            this.radTreeView1.Nodes[0].Nodes[0].Font = new Font("Microsoft Sans Serif", 8.25F, FontStyle.Bold, GraphicsUnit.Point, 0);
            this.radTreeView1.Nodes[0].Nodes[2].Font = new Font("Microsoft Sans Serif", 8.25F, FontStyle.Bold, GraphicsUnit.Point, 0);

            var tvx = this.radTreeView1.TreeViewXml;
        }

var xml = "<TreeView xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" MultiSelect=\"true\" AllowDragDrop=\"true\" LabelEdit=\"true\" AllowDrop=\"true\">  <Nodes Text=\"New Package\" Expanded=\"true\" ImageKey=\"Package\" Font=\"Microsoft Sans Serif; 8,25pt; style=Bold\">    <Tag xsi:type=\"xsd:string\">&lt;Info&gt;&lt;FullName&gt;\\New Package&lt;/FullName&gt;&lt;ObjectType&gt;Package&lt;/ObjectType&gt;&lt;IsRunnable&gt;False&lt;/IsRunnable&gt;&lt;IsContainer&gt;true&lt;/IsContainer&gt;&lt;/Info&gt;</Tag>    <Nodes Text=\"Query Engine\" ImageKey=\"QueryEngine\" Expanded=\"true\" Font=\"Microsoft Sans Serif; 8,25pt; style=Bold\">      <Tag xsi:type=\"xsd:string\">&lt;Info&gt;&lt;FullName&gt;\\Query Engine&lt;/FullName&gt;&lt;ObjectType&gt;QueryEngine&lt;/ObjectType&gt;&lt;IsRunnable&gt;true&lt;/IsRunnable&gt;&lt;IsTableEntity&gt;true&lt;/IsTableEntity&gt;&lt;IsCut&gt;false&lt;/IsCut&gt;&lt;/Info&gt;</Tag>    </Nodes>    <Nodes Text=\"Connector\" ImageKey=\"Irion.SQLServer\">      <Tag xsi:type=\"xsd:string\">&lt;Info&gt;&lt;FullName&gt;\\Connector&lt;/FullName&gt;&lt;ObjectType&gt;DBConnection&lt;/ObjectType&gt;&lt;IsCut&gt;false&lt;/IsCut&gt;&lt;/Info&gt;</Tag>    </Nodes>    <Nodes Text=\"Connector Link\" ImageKey=\"DatabaseDatalink\">      <Tag xsi:type=\"xsd:string\">&lt;Info&gt;&lt;FullName&gt;\\Connector Link&lt;/FullName&gt;&lt;ObjectType&gt;DatabaseDatalink&lt;/ObjectType&gt;&lt;IsRunnable&gt;true&lt;/IsRunnable&gt;&lt;IsTableEntity&gt;true&lt;/IsTableEntity&gt;&lt;IsCut&gt;false&lt;/IsCut&gt;&lt;/Info&gt;</Tag>    </Nodes>  </Nodes></TreeView>";