Skinning the content manager explorer is already in place.
I have tried below option to add label in TitlebarContainer.
Created component to control show/hide of message in Titlebar.
Created javascript file to read configuration component[show/hide the message].
Added label[Value from component] next to "Breadcrumb" section in Titlebar through javascript.
Included javascript reference in "web\WebUI\Editors\CME\Configuration\CME.config" file.
<group name="SDL.Web.UI.Editors.CME.Theme.Environments.Development"> <fileset> <file type="style">{ThemePath}/Environments/FILENAME.CSS</file> <file type="script">{ThemePath}/Environments/CustomMessage.js</file> </fileset> </group>
Increased the value of the modification attribute in "web\WebUI\WebRoot\Configuration\System.config"
I have to re-write the script(if changes in "TitlebarContainer" elements) to use the label implementation in Tridion upgrades.
Adding a script reference in group "SDL.Web.UI.Editors.CME.Theme.Environments.Development" to implement this label is a valid approach ?.