Basic Components are page elements that can exist by themselves such as text elements, images, tables, frames, etc

Dependent Components are page elements that cannot exist by themselves since their functionality is based on other components. For example a Reverse Control is reversing the actions of and is dependent of a master button with different actions on subsequent clicks.

Subcomponents are fragments of component such as text paragraphs that are formatted differently that the encompassing text element or images embedded within text elements.

Components appearance is set using various attributes.