Missing add button about silverstripe-blocks HOT 11 CLOSED

    "silverstripe/cms": "3.1.*@stable",
    "silverstripe/framework": "3.1.*@stable",
     "sheadawson/silverstripe-blocks" : "1.0.8"

{
    "name": "silverstripe/installer",
    "description": "The SilverStripe Framework Installer",
    "require": {
        "php": ">=5.3.3",
        "silverstripe/cms": "3.4.1",
        "silverstripe/framework": "3.4.1",
        "silverstripe/reports": "3.4.1",
        "silverstripe/siteconfig": "3.4.1",
        "sheadawson/silverstripe-blocks": "^1.1",
        "unisolutions/silverstripe-copybutton": "^1.0",
        "micschk/silverstripe-gridfieldsitetreebuttons": "^1.0",
        "micschk/silverstripe-excludechildren": "^1.1"
    },
    "require-dev": {
        "phpunit/PHPUnit": "~3.7@stable",
        "oddnoc/silverstripe-artefactcleaner": "^3.0"
    },
    "config": {
        "process-timeout": 600
    },
    "prefer-stable": true,
    "minimum-stability": "dev"
}

---
Name: mysite
After:
  - 'framework/*'
  - 'cms/*'
---
# YAML configuration for SilverStripe
# See http://doc.silverstripe.org/framework/en/topics/configuration
# Caution: Indentation through two spaces, not tabs
SSViewer:
  theme: 'simple'
BlockManager:
    themes:
        simple:
            areas:
                Sidebar: true # a Sidebar area will be available on all page types in simple theme
                BeforeContentA:
                    only: HomePage # a BeforeContent area will be available only on HomePage page types in simple theme
                AfterContentB:
                    except: HomePage # a AfterContent area will be available on all page types except HomePage in simple theme
                Footer: true # a Footer area will be available on all page types in simple theme

            use_blocksets: true # Whether to use BlockSet functionality (default if undeclared: true)
            use_extra_css_classes: true # Whether to allow cms users to add extra css classes to blocks (default if undeclared: false)
            prefix_default_css_classes: 'myprefix--' # prefix the automatically generated CSSClasses based on class name (default if undeclared: false)
            #pagetype_whitelist: # Enable the Blocks tab only pages of these types (optional)
            #  - HomePage
            #pagetype_blacklist: # Disable the Blocks tab on pages of these types (optional)
            #  - ContactPage
            #disabled_blocks: #allows you to disable specific blocks (optional)
            #  - ContentBlock
    use_default_blocks: true # Disable/enable the default Block types (ContentBlock) (default if undeclared: true)
    block_area_preview: true # Disable block area preview button in CMS (default if undeclared: true)