Rich Text Editor
Rich Text Editor is the interface for editing rich text, which presents the user with a "what-you-see-is-what-you-get" editing area.
Default value: Select which option will be the default value.
Readonly: When on, user will not be able to input anything.
Text Change: Triggered when a user changes text in the editor.
Set Rich Text: Set the input value.
Set Validate Result: Set whether the input is valid.