Fix compute PlaceHolder position

.gitignore

@@ -1,5 +1,322 @@
-/AlphaChiTech.Virtualization/bin
-/AlphaChiTech.Virtualization/obj
-/DataGridDemo/bin
-/DataGridDemo/obj
-/packages
+## Ignore Visual Studio temporary files, build results, and
+## files generated by popular Visual Studio add-ons.
+##
+## Get latest from https://github.com/github/gitignore/blob/master/VisualStudio.gitignore
+
+# User-specific files
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+
+# User-specific files (MonoDevelop/Xamarin Studio)
+*.userprefs
+
+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+bld/
+[Bb]in/
+[Oo]bj/
+[Ll]og/
+
+# Visual Studio 2015/2017 cache/options directory
+.vs/
+# Uncomment if you have tasks that create the project's static files in wwwroot
+#wwwroot/
+
+# Visual Studio 2017 auto generated files
+Generated\ Files/
+
+# MSTest test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+
+# NUNIT
+*.VisualState.xml
+TestResult.xml
+
+# Build Results of an ATL Project
+[Dd]ebugPS/
+[Rr]eleasePS/
+dlldata.c
+
+# Benchmark Results
+BenchmarkDotNet.Artifacts/
+
+# .NET Core
+project.lock.json
+project.fragment.lock.json
+artifacts/
+**/Properties/launchSettings.json
+
+# StyleCop
+StyleCopReport.xml
+
+# Files built by Visual Studio
+*_i.c
+*_p.c
+*_i.h
+*.ilk
+*.meta
+*.obj
+*.pch
+*.pdb
+*.pgc
+*.pgd
+*.rsp
+*.sbr
+*.tlb
+*.tli
+*.tlh
+*.tmp
+*.tmp_proj
+*.log
+*.vspscc
+*.vssscc
+.builds
+*.pidb
+*.svclog
+*.scc
+
+# Chutzpah Test files
+_Chutzpah*
+
+# Visual C++ cache files
+ipch/
+*.aps
+*.ncb
+*.opendb
+*.opensdf
+*.sdf
+*.cachefile
+*.VC.db
+*.VC.VC.opendb
+
+# Visual Studio profiler
+*.psess
+*.vsp
+*.vspx
+*.sap
+
+# Visual Studio Trace Files
+*.e2e
+
+# TFS 2012 Local Workspace
+$tf/
+
+# Guidance Automation Toolkit
+*.gpState
+
+# ReSharper is a .NET coding add-in
+_ReSharper*/
+*.[Rr]e[Ss]harper
+*.DotSettings.user
+
+# JustCode is a .NET coding add-in
+.JustCode
+
+# TeamCity is a build add-in
+_TeamCity*
+
+# DotCover is a Code Coverage Tool
+*.dotCover
+
+# AxoCover is a Code Coverage Tool
+.axoCover/*
+!.axoCover/settings.json
+
+# Visual Studio code coverage results
+*.coverage
+*.coveragexml
+
+# NCrunch
+_NCrunch_*
+.*crunch*.local.xml
+nCrunchTemp_*
+
+# MightyMoose
+*.mm.*
+AutoTest.Net/
+
+# Web workbench (sass)
+.sass-cache/
+
+# Installshield output folder
+[Ee]xpress/
+
+# DocProject is a documentation generator add-in
+DocProject/buildhelp/
+DocProject/Help/*.HxT
+DocProject/Help/*.HxC
+DocProject/Help/*.hhc
+DocProject/Help/*.hhk
+DocProject/Help/*.hhp
+DocProject/Help/Html2
+DocProject/Help/html
+
+# Click-Once directory
+publish/
+
+# Publish Web Output
+*.[Pp]ublish.xml
+*.azurePubxml
+# Note: Comment the next line if you want to checkin your web deploy settings,
+# but database connection strings (with potential passwords) will be unencrypted
+*.pubxml
+*.publishproj
+
+# Microsoft Azure Web App publish settings. Comment the next line if you want to
+# checkin your Azure Web App publish settings, but sensitive information contained
+# in these scripts will be unencrypted
+PublishScripts/
+
+# NuGet Packages
+*.nupkg
+# The packages folder can be ignored because of Package Restore
+**/[Pp]ackages/*
+# except build/, which is used as an MSBuild target.
+!**/[Pp]ackages/build/
+# Uncomment if necessary however generally it will be regenerated when needed
+#!**/[Pp]ackages/repositories.config
+# NuGet v3's project.json files produces more ignorable files
+*.nuget.props
+*.nuget.targets
+
+# Microsoft Azure Build Output
+csx/
+*.build.csdef
+
+# Microsoft Azure Emulator
+ecf/
+rcf/
+
+# Windows Store app package directories and files
+AppPackages/
+BundleArtifacts/
+Package.StoreAssociation.xml
+_pkginfo.txt
+*.appx
+
+# Visual Studio cache files
+# files ending in .cache can be ignored
+*.[Cc]ache
+# but keep track of directories ending in .cache
+!*.[Cc]ache/
+
+# Others
+ClientBin/
+~$*
+*~
+*.dbmdl
+*.dbproj.schemaview
+*.jfm
+*.pfx
+*.publishsettings
+orleans.codegen.cs
+
+# Including strong name files can present a security risk 
+# (https://github.com/github/gitignore/pull/2483#issue-259490424)
+#*.snk
+
+# Since there are multiple workflows, uncomment next line to ignore bower_components
+# (https://github.com/github/gitignore/pull/1529#issuecomment-104372622)
+#bower_components/
+
+# RIA/Silverlight projects
+Generated_Code/
+
+# Backup & report files from converting an old project file
+# to a newer Visual Studio version. Backup files are not needed,
+# because we have git ;-)
+_UpgradeReport_Files/
+Backup*/
+UpgradeLog*.XML
+UpgradeLog*.htm
+
+# SQL Server files
+*.mdf
+*.ldf
+*.ndf
+
+# Business Intelligence projects
+*.rdl.data
+*.bim.layout
+*.bim_*.settings
+
+# Microsoft Fakes
+FakesAssemblies/
+
+# GhostDoc plugin setting file
+*.GhostDoc.xml
+
+# Node.js Tools for Visual Studio
+.ntvs_analysis.dat
+node_modules/
+
+# TypeScript v1 declaration files
+typings/
+
+# Visual Studio 6 build log
+*.plg
+
+# Visual Studio 6 workspace options file
+*.opt
+
+# Visual Studio 6 auto-generated workspace file (contains which files were open etc.)
+*.vbw
+
+# Visual Studio LightSwitch build output
+**/*.HTMLClient/GeneratedArtifacts
+**/*.DesktopClient/GeneratedArtifacts
+**/*.DesktopClient/ModelManifest.xml
+**/*.Server/GeneratedArtifacts
+**/*.Server/ModelManifest.xml
+_Pvt_Extensions
+
+# Paket dependency manager
+.paket/paket.exe
+paket-files/
+
+# FAKE - F# Make
+.fake/
+
+# JetBrains Rider
+.idea/
+*.sln.iml
+
+# CodeRush
+.cr/
+
+# Python Tools for Visual Studio (PTVS)
+__pycache__/
+*.pyc
+
+# Cake - Uncomment if you are using it
+# tools/**
+# !tools/packages.config
+
+# Tabs Studio
+*.tss
+
+# Telerik's JustMock configuration file
+*.jmconfig
+
+# BizTalk build output
+*.btp.cs
+*.btm.cs
+*.odx.cs
+*.xsd.cs
+
+# OpenCover UI analysis results
+OpenCover/
+
+# Azure Stream Analytics local run output 
+ASALocalRun/
+
+# MSBuild Binary and Structured Log
+*.binlog

.nuget/NuGet.Config

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
+
 <configuration>
   <solution>
     <add key="disableSourceControlIntegration" value="true" />

AlphaChiTech.Virtualization.sln

@@ -1,10 +1,8 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 2013
-VisualStudioVersion = 12.0.31101.0
+# Visual Studio 15
+VisualStudioVersion = 15.0.27130.2027
 MinimumVisualStudioVersion = 10.0.40219.1
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AlphaChiTech.Virtualization", "AlphaChiTech.Virtualization\AlphaChiTech.Virtualization.csproj", "{5455EE53-36B9-48E8-B1F0-EB7C6ABB7A57}"
-EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DataGridAsyncDemo", "DataGridAsyncDemo\DataGridAsyncDemo.csproj", "{B1235F30-C8A9-4A18-B870-A7F23F214039}"
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = ".nuget", ".nuget", "{90A3E488-4EFC-4E8C-BE36-B03651A95625}"
@@ -14,22 +12,44 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = ".nuget", ".nuget", "{90A3E4
 		.nuget\NuGet.targets = .nuget\NuGet.targets
 	EndProjectSection
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DataGridAsyncDemoMVVM", "DataGridAsyncDemoMVVM\DataGridAsyncDemoMVVM.csproj", "{DE19AAA5-881C-48BE-A8E7-A8799F5C4BD3}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "VirtualizingCollection", "VirtualizingCollection\VirtualizingCollection.csproj", "{D8D58C1D-2596-45AD-83BD-E0D5C9FA7F69}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "VirtualizingCollection.Tests", "VirtualizingCollection.Tests\VirtualizingCollection.Tests.csproj", "{DA20F632-94B1-48B6-A4BB-5262E3EC2973}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{F3339508-BAE9-47BD-B013-BF4C334B729B}"
+	ProjectSection(SolutionItems) = preProject
+		README.md = README.md
+	EndProjectSection
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
 		Release|Any CPU = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{5455EE53-36B9-48E8-B1F0-EB7C6ABB7A57}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{5455EE53-36B9-48E8-B1F0-EB7C6ABB7A57}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{5455EE53-36B9-48E8-B1F0-EB7C6ABB7A57}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{5455EE53-36B9-48E8-B1F0-EB7C6ABB7A57}.Release|Any CPU.Build.0 = Release|Any CPU
 		{B1235F30-C8A9-4A18-B870-A7F23F214039}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{B1235F30-C8A9-4A18-B870-A7F23F214039}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{B1235F30-C8A9-4A18-B870-A7F23F214039}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{B1235F30-C8A9-4A18-B870-A7F23F214039}.Release|Any CPU.Build.0 = Release|Any CPU
+		{DE19AAA5-881C-48BE-A8E7-A8799F5C4BD3}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{DE19AAA5-881C-48BE-A8E7-A8799F5C4BD3}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{DE19AAA5-881C-48BE-A8E7-A8799F5C4BD3}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{DE19AAA5-881C-48BE-A8E7-A8799F5C4BD3}.Release|Any CPU.Build.0 = Release|Any CPU
+		{D8D58C1D-2596-45AD-83BD-E0D5C9FA7F69}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{D8D58C1D-2596-45AD-83BD-E0D5C9FA7F69}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{D8D58C1D-2596-45AD-83BD-E0D5C9FA7F69}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{D8D58C1D-2596-45AD-83BD-E0D5C9FA7F69}.Release|Any CPU.Build.0 = Release|Any CPU
+		{DA20F632-94B1-48B6-A4BB-5262E3EC2973}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{DA20F632-94B1-48B6-A4BB-5262E3EC2973}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{DA20F632-94B1-48B6-A4BB-5262E3EC2973}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{DA20F632-94B1-48B6-A4BB-5262E3EC2973}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
 	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {D457F9E2-2C21-4C1F-93EA-EE4DAD2CA2E4}
+	EndGlobalSection
 EndGlobal