Collapsing nodes

Which language is this for, a custom language that you made?

If this is a custom language and you want to use the AST model for outlining, look at the SimpleSyntaxLanguage.PerformAutomaticOutlining method in the sample project. That shows how to use the AST tree to generate outlining nodes. Also note that the AST nodes that will be outlining nodes must implement ICollapsibleNode (like the Simple language's FunctionDeclaration does).

Indeed, a custom language. I implemented/copied the PerformAutomaticOutlining method but its never called.

My compilationUnit implements My AstNode, ICompilationUnit
My AStnode contains an implementation of ICollapsibleNode , none is called

My SemanticParser doesnt implement IRecursiveDescentLexicalParser. Should it?

First let me ask, do you have Document.Outlining.Mode set to Automatic?

Sorry people, somehow Outline mode was not set:( Stupid me. At least it already shows the little squares, now i have to fix the offsets:)