Markers inoperative

Hello, Recently, while fussing with the layout and cluttering up my workspace I selected the menu item Workspace / Layout / Restore Default Layout. Now, the markers dialogue and the menu item Workspace / Specific Tool Windows / Markers are both greyed out. How can I get the markers dialogue to work again?
Thanks, Kevin

Wavelab 8
Windows 7 Pro

I figured it out. For anyone who is interested I had the workspace layout locked. Unlocking it by deselecting Workspace / Lock Layout activated the markers dialogue.