Visual Studio Expand/Collapse Button Missing In Aspx File

As you can see on the image below my aspx files does not have collapse/expand buttons ("-" and "+") How can I enable them again? thanks in advance. Running VS2010.

No Collapse

How do I enable expand collapse in Visual Studio?

CTRL + M + M will collapse/expand the current section.

How do I collapse a section in Visual Studio?

(Ctrl+M, Ctrl+P) - Removes all outlining information for the entire document. (Ctrl+M, Ctrl+U) - Removes the outlining information for the currently selected user-defined region. Not available in Visual Basic. (Ctrl+M, Ctrl+O) - Collapses the members of all types.

What is the expand collapse button?

This pattern creates a button that toggles an element as hidden (collapsed) or not hidden (expanded). The element's current state and changes in the element's state are communicated to screen reader users.

Follow this menu command:

Edit > Outlining > Start Automatic Outlining