Create a Zen Page using an ObjectScript class method

The following class contains 1 class method "test" that creates a Zen Application and Page:

Class objectscript.createZenPage
{
    classmethod test() {
        // create Application...
        set app=##class(%Dictionary.ClassDefinition).%New()
        set app.Super="%ZEN.application"
        set app.Name="ZenTest.MyZenApplication"
        set app.ProcedureBlock=1
         
        set param=##class(%Dictionary.ParameterDefinition).%New()
        set param.Name="APPLICATIONNAME"
        set param.Default="MyZenApplication"
        set param.parent=app
        do param.%Save()
         
        set param=##class(%Dictionary.ParameterDefinition).%New()
        set param.Name="HOMEPAGE"
        set param.Default=""
        set param.parent=app
        do param.%Save()
         
        set ok=app.%Save()
        if 'ok {
                do DecomposeStatus^%apiOBJ(ok,.err)
                write "Error creating App class: "_err(1),!
                }
         
        // create Page...
        set page=##class(%Dictionary.ClassDefinition).%New()
        set page.Name="ZenTest.MyZenPage"
        set page.ProcedureBlock=1
        set page.Super="%ZEN.Component.page"
         
        set param=##class(%Dictionary.ParameterDefinition).%New()
        set param.Name="APPLICATIONNAME"
        set param.Default="ZenTest.MyZenApplication"
        set param.parent=page
        do param.%Save()
         
        set param=##class(%Dictionary.ParameterDefinition).%New()
        set param.Name="PAGENAME"
        set param.Default="MyZenPage"
        set param.parent=page
        do param.%Save()
         
        set xds=##class(%Dictionary.XDataDefinition).%New()
        set xds.parent=page
        set xds.Name="Style"
        set xds.Data=##class(%Stream.TmpCharacter).%New()
        do xds.Data.Rewind()
        do xds.Data.Write(" ")
        do xds.%Save()
         
        set xdc=##class(%Dictionary.XDataDefinition).%New()
        set xdc.parent=page
        set xdc.Name="Content"
        set xdc.XMLNamespace="http://www.intersystems.com/zen"
        set xdc.Data=##class(%Stream.TmpCharacter).%New()
        do xdc.Data.Rewind()
        do xdc.Data.Write(" ")
        do xdc.Data.Write($c(13,10))
        do xdc.Data.Write(" ")
        do xdc.Data.Write($c(13,10))
        do xdc.Data.Write(" ")
        do xdc.Data.Write($c(13,10))
        do xdc.%Save()
         
        set method=##class(%Dictionary.MethodDefinition).%New()
        set method.Name="%OnAfterCreatePage"
        set method.ReturnType="%Status"
        set method.parent=page
        //implementation is a %Stream
        set code=##class(%Stream.TmpCharacter).%New()
        do code.Rewind()
        do code.Write(" Set tBtn = ##class(%ZEN.Component.button).%New()")
        do code.Write($c(13,10)) // carriage return line feed
        do code.Write(" Set tBtn.caption = ""Button 2""")
        do code.Write($c(13,10))
        do code.Write(" Do %page.%AddChild(tBtn)"_$c(13,10))
        do code.Write($c(13,10))
        do code.Write(" quit $$$OK")
        do code.Write($c(13,10))
        set method.Implementation=code
        do method.%Save()
         
        set ok=page.%Save()
        if 'ok {
                do DecomposeStatus^%apiOBJ(ok,.err)
                write "Error creating Page class: "_err(1),!
                }
         
        do $system.OBJ.Compile("ZenTest.MyZenApplication")     
        do $system.OBJ.Compile("ZenTest.MyZenPage")    
        quit
    }
}

Here's a link to the code on GitHub: https://github.com/intersystems-community/code-snippets/blob/master/src/...