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Gtk# application is not rendering TreeView Properly

I am trying to develop a gtk application on mac using gtk#. I created a tree view just like in the tutorial but the arrows are not rendering properly as seem below, there are no arrows. I can click to open and close but the actual arrows aren't working.
I copy pasted the code from the tutorial and It did the same thing, but here is my code anywhere. I have also verified view.ShowExpanders is set to true
Application.Init();
Window window = new Window("Editor Window");
window.SetPosition(WindowPosition.Center);
window.HeightRequest = 800;
window.WidthRequest = 1200;
TreeView view = new TreeView();
view.WidthRequest = 500;
TreeViewColumn column = new TreeViewColumn();
column.Title = "Heirarchy";
CellRendererText cell = new CellRendererText();
column.PackStart(cell, true);
view.AppendColumn(column);
column.AddAttribute(cell, "text", 0);
TreeStore store = new TreeStore(typeof(string));
TreeIter i = store.AppendValues("Project");
i = store.AppendValues(i,"Room1");
i = store.AppendValues(i, "Item");
store.AppendValues(i, "Attribute");
store.AppendValues(i, "Attribute");
store.AppendValues(i, "Attribute");
view.ShowExpanders = true;
view.Model = store;
view.ShowExpanders = true;
window.Add(view);
window.DeleteEvent += ExitWindow;
window.ShowAll();
Application.Run();
Is there some sort of image asset that doesn't exist on my computer? How would I install that on mac? Thank you for any help you can provide.

As a comment suggested, using brew install adwaita-icon-theme fixed the problem

How to show print dialog in Crystal Report?

I want to print my Crystal report direct to the printer. Currently I am having the export to PDF. But my client want this to go to Printer directly. How can I show the Print Dialog on click of Print Button to Print the report directly to Printer.
I would like to mention: I am using C# and asp.net for my project.
Thank you.

Try the following code
private void Button1_Click(object sender, EventArgs e)
{
CrystalReport1 report1 = new CrystalReport1();
PrintDialog dialog1 = new PrintDialog();
report1.SetDatabaseLogon("username", "password");
dialog1.AllowSomePages = true;
dialog1.AllowPrintToFile = false;
if (dialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
int copies = dialog1.PrinterSettings.Copies;
int fromPage = dialog1.PrinterSettings.FromPage;
int toPage = dialog1.PrinterSettings.ToPage;
bool collate = dialog1.PrinterSettings.Collate;
report1.PrintOptions.PrinterName = dialog1.PrinterSettings.PrinterName;
report1.PrintToPrinter(copies, collate, fromPage, toPage);
}
report1.Dispose();
dialog1.Dispose();
}
you will have to change the "username" and the "password" with the credentials of your database.
EDIT
This code can be used for server side printing only.

No way; Cristal Report Viewer is intended for showing and browsing a report.
It never shows all report pages.
It has no buttons or methods for direct printing.
You could, instead, export directly the report in PDF so Report Viewer is never seen by users, and printing becomes 1-click operation.

PrintButton_click Event and add following code as you ..
//show Print Dialog
PrintDialog printDialog = new PrintDialog();
DialogResult dr = printDialog.ShowDialog();
if (dr == DialogResult.OK)
{
ReportDocument crReportDocument = (ReportDocument)CrystalReportViewer1.ReportSource;
System.Drawing.Printing.PrintDocument printDocument1 = new System.Drawing.Printing.PrintDocument();
//Get the Copy times
int nCopy = printDocument1.PrinterSettings.Copies;
//Get the number of Start Page
int sPage = printDocument1.PrinterSettings.FromPage;
//Get the number of End Page
int ePage = printDocument1.PrinterSettings.ToPage;
crReportDocument.PrintOptions.PrinterName =printDocument1.PrinterSettings.PrinterName;
//Start the printing process. Provide details of the print job
crReportDocument.PrintToPrinter(nCopy, false, sPage, ePage);
// Form_Printerd = true;
}

Printing without ShowDialog gives blank pages

I am experiencing an odd issue with printing from a WPF project. I'm printing a screen capture of the application for reporting purposes, and all that works just fine. Currently the user presses print, the print dialog appears, and they print out the capture image.
However, I want to be able to print directly to the default printer without showing the dialog box. This should be easily done by commenting out the ShowDialog() statement and allowing the rest to just happen. The printer still prints, but the pages are always blank.
Can anyone explain this behavior?
private void PrintCurrentScreen()
{
PrintDialog PD = new PrintDialog();
PD.PrintTicket.OutputColor = OutputColor.Grayscale;
PD.PrintTicket.OutputQuality = OutputQuality.Draft;
PrintTicket PT = new PrintTicket();
PT.PageOrientation = PageOrientation.Landscape;
PT.CopyCount = 1;
PT.PageBorderless = System.Printing.PageBorderless.Borderless;
//---Blank pages print when commented out---//
//if (PD.ShowDialog() == true)
//{
PD.PrintTicket = PT;
DrawingVisual DV = new DrawingVisual();
DV.Offset = new Vector(20, 20);
DrawingContext DC = DV.RenderOpen();
DC.DrawImage(previewimage.Source, new Rect(new Size(PD.PrintableAreaWidth - 40, PD.PrintableAreaHeight - 40)));
DC.Close();
PD.PrintVisual(DV, "TEST");
//}
}

Try doing a Measure, Arrange, and UpdateLayout right before the printvisual, like this:
DV.Measure(new System.Windows.Size(PD.PrintableAreaWidth,
PD.PrintableAreaHeight));
DV.Arrange(new System.Windows.Rect(new System.Windows.Point(0, 0),
DV.DesiredSize));
DV.UpdateLayout();
PD.PrintVisual(DV, "TEST");

Page-Range-Problem at Printing a Document

i try to print out the content of my editor:
PrintDialog pd = new PrintDialog();
pd.PageRangeSelection = PageRangeSelection.AllPages;
pd.UserPageRangeEnabled = true;
FlowDocument fd = DocumentPrinter.CreateFlowDocumentForEditor(CurrentDocument.Editor);
DocumentPaginator dp = ((IDocumentPaginatorSource)fd).DocumentPaginator;
bool? res = pd.ShowDialog();
if (res.HasValue && res.Value)
{
fd.PageHeight = pd.PrintableAreaHeight;
fd.PageWidth = pd.PrintableAreaWidth;
fd.PagePadding = new Thickness(50);
fd.ColumnGap = 0;
fd.ColumnWidth = pd.PrintableAreaWidth;
pd.PrintDocument(dp, CurrentDocument.Editor.FileName);
}
The test-document i used has about 14 pages (with this pagesize-settings).
i tested it: the printdialog appears and I´ve chosen a pagerange (i typed "1-3" into the textbox) and clicked print. above the printdocument() I set a breakpoint and looked into the printdialog-object. it says pd.PageRangeSelection = PageRangeSelection.UserPage and pd.PageRange = {1-3}. I guess this is right, because I wanted to print out only page 1-3. then the printdocument() executed and in the output-pdf (for testing I use a pdf-printer) has 14 pages (the whole document was printed).
where is my mistake? why does the pagerange-setting not work?
thanks for your help

In your code you manually set:
pd.PageRangeSelection = PageRangeSelection.AllPages;
This is why your code prints all the pages.

The reason for this is because FlowDocument's DocumentPaginator does not handle UserPageRanges. You can see that FlowDocument implementation creates a FlowDocumentPaginator, and it doesn't take into account ranges.
If it did handle it, in FlowDocumentPaginator.(Async)GetPage you would see, code checking to see if the page requested to be printed is in an index of available pages; or maybe if a key exists in a Dictionary whose value is the DocumentPage to print.
In other words, and the reason the PrintDialog default has UserPageRangeEnabled set to false, is because in order to use that feature, you'll usually have to write your own DocumentPaginator or you have to add some logic to compile a new temporary document to hold only the pages you want to print.
Feel free to ask any questions.

How to print directly, without Print Dialog in WPF?

I just want to know how I can print a flow document without showing Print Dialog in WPF.
Thanks for help…

You can use the PrintDialog class without showing the dialog (without calling ShowModal)

This is one of the ways you can change default printer or change other settings:
using System.Printing; //add reference to System.Printing Assembly
//if you want to modify PrintTicket, also add
//reference to ReachFramework.dll (part of .net install)
...
var dlg = new PrintDialog();
dlg.PrintQueue = printer; // this will be your printer. any of these: new PrintServer().GetPrintQueues()
dlg.PrintTicket.CopyCount = 3; // number of copies
dlg.PrintTicket.PageOrientation = PageOrientation.Landscape;
dlg.PrintVisual(canvas);

Try
PrintDialog dialog = new PrintDialog();
dialog.PrintVisual(_PrintCanvas, "My Canvas");