When a content type is selected in the existing content types tool, I want to see the general informations of this content type (icon, label, description, mixin, ...):

• Select a content type
• A contextual tab appears in the ribbon
• There is a button "open content type" in the tab
• Click on the "open content type" button
• The content type editor appears with the general informations of the selected content type
• Show the general information of another content type
• Select the first content type editor tool
• In the content type list, the cont type selected is the first one

Additional information:

• the "open content type" button has to be deactivated if no content type is selected (even in the search tool of the ribbon)
• the contextual tab disappears when no content type is selected