"Wrap with Center" and "Wrap with Padding" are not active in Flutter Outline Tool panel

[hiikanych]

Steps to Reproduce

I try wrap Row widget with Center (or Padding) widget by button in Flutter Outline Tool panel, but this button is not active.

Version info

C:\src\flutter\bin\flutter.bat doctor --verbose
[√] Flutter (Channel stable, v1.9.1+hotfix.6, on Microsoft Windows [Version 10.0.18363.476], locale en-US)
• Flutter version 1.9.1+hotfix.6 at C:\src\flutter
• Framework revision 68587a0916 (3 months ago), 2019-09-13 19:46:58 -0700
• Engine revision b863200c37
• Dart version 2.5.0

[√] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
• Android SDK at C:\Users\xxx\AppData\Local\Android\sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-29, build-tools 29.0.2
• Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)
• All Android licenses accepted.

[√] Android Studio (version 3.5)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin version 42.1.1
• Dart plugin version 191.8593
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)

[√] Connected device (1 available)
• Google Pixel 2 • 192.168.226.102:5555 • android-x86 • Android 9 (API 28)

• No issues found!
Process finished with exit code 0

[terrylucas]

You need to define

    `factory MyWidget.forDesignTime() `

inside of your DicePage widget.

see Live Widget Preview