Visual Studio 2015 not showing project folder content

Question

Fixed by Repairing the VS2015 from the setup file.

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I've added a VS 2013 project to Visual Studio 2015. It compiles and runs as expected, but in Solution Explore i can't see the content of the folders.

I've tried deleting the folders and adding them again, but it didn't work.

Any ideas? I also use SourceTree for the project, but i don't think it's relevant.

[![enter image description here][1]][1]

[1]: http://i.stack.imgur.com/Bhm3B.png

Edit 1: Please note that this issues happens to all the folders in the project (Resourfes, Themes, Sources)

1.) The files exist and are visible in Windows Explorer

2.) Deleting and adding the folder again, or the individual files in a newly created folder does not change the situation.

3.) csproj has the files that are not show in the folders :

     <ItemGroup>
    <ApplicationDefinition Include="App.xaml">
      <Generator>MSBuild:Compile</Generator>
      <SubType>Designer</SubType>
    </ApplicationDefinition>
    <Compile Include="Sources\LoginViewModel.cs" />
    <Compile Include="Sources\RelayCommand.cs" />
    <Compile Include="Sources\ViewModel.cs" />
    <Compile Include="Login.xaml.cs">
      <DependentUpon>Login.xaml</DependentUpon>
    </Compile>
    <Compile Include="WrongPassword.xaml.cs">
      <DependentUpon>WrongPassword.xaml</DependentUpon>
    </Compile>
    <Page Include="MainWindow.xaml">
      <Generator>MSBuild:Compile</Generator>
      <SubType>Designer</SubType>
    </Page>
    <Compile Include="App.xaml.cs">
      <DependentUpon>App.xaml</DependentUpon>
      <SubType>Code</SubType>
    </Compile>
    <Compile Include="MainWindow.xaml.cs">
      <DependentUpon>MainWindow.xaml</DependentUpon>
      <SubType>Code</SubType>
    </Compile>
    <Page Include="Resources\Icons.xaml">
      <Generator>MSBuild:Compile</Generator>
      <SubType>Designer</SubType>
    </Page>
    <Page Include="Themes\Metro\Dark\MetroDark.MSControls.Core.Implicit.xaml">
      <Generator>MSBuild:Compile</Generator>
      <SubType>Designer</SubType>
    </Page>
    <Page Include="Themes\Metro\Dark\MetroDark.MSControls.Toolkit.Implicit.xaml">
      <Generator>MSBuild:Compile</Generator>
      <SubType>Designer</SubType>
    </Page>
    <Page Include="Themes\Metro\Dark\Styles.Shared.xaml">
      <Generator>MSBuild:Compile</Generator>
      <SubType>Designer</SubType>
    </Page>
    <Page Include="Themes\Metro\Dark\Styles.WPF.xaml">
      <Generator>MSBuild:Compile</Generator>
      <SubType>Designer</SubType>
    </Page>
    <Page Include="Themes\Metro\Dark\Theme.Colors.xaml">
      <Generator>MSBuild:Compile</Generator>
      <SubType>Designer</SubType>
    </Page>
    <Page Include="Themes\Metro\Light\Metro.MSControls.Core.Implicit.xaml">
      <Generator>MSBuild:Compile</Generator>
      <SubType>Designer</SubType>
    </Page>
    <Page Include="Themes\Metro\Light\Metro.MSControls.Toolkit.Implicit.xaml">
      <Generator>MSBuild:Compile</Generator>
      <SubType>Designer</SubType>
    </Page>
    <Page Include="Themes\Metro\Light\Styles.Shared.xaml">
      <Generator>MSBuild:Compile</Generator>
      <SubType>Designer</SubType>
    </Page>
    <Page Include="Themes\Metro\Light\Styles.WPF.xaml">
      <Generator>MSBuild:Compile</Generator>
      <SubType>Designer</SubType>
    </Page>
    <Page Include="Themes\Metro\Light\Theme.Colors.xaml">
      <Generator>MSBuild:Compile</Generator>
      <SubType>Designer</SubType>
    </Page>
    <Page Include="Login.xaml">
      <SubType>Designer</SubType>
      <Generator>MSBuild:Compile</Generator>
    </Page>
    <Page Include="WrongPassword.xaml">
      <SubType>Designer</SubType>
      <Generator>MSBuild:Compile</Generator>
    </Page>
  </ItemGroup>

Answer 1

After adding the file to the correct folder. Click on the Show all Files option, include the file in the project. And that's it