...
a colored header, including:
a label (see Content below).
a close button (unless otherwise specified).
a help button (optional).
a content area, which contains:
a title, describing the action that will be performed. (Optional for Dialog popups only, where space is limited).
the main content including any text, inputs and controls.
Dialog buttons at the bottom of the popup, including:
a primary action button.
a secondary and other action buttons (where relevant).
...