In Detail:

Properties

reference list of all the properties which can be set for objects

General:

Size
Position
Skew
Rotation
Initially Hidden
Display For
Mouse Clicks Auto-Repeat
Ignore Transparent Area
Stop Clicks Passing Through
Fix Object to Page

Background:

Colour & Gradient (customizable with multiple points)
Border
Image
Transparency

Button:

Colour
Bevel Colour
Bevel Width
Bevel Transparency
Black Outline
Push Button
Checkbox
Radio Button

Image:

Scale
Centre
Tile
Scale to Fit
Maintain Aspect Ratio
Transparent Colour with Tolerance

Border:

Style (Plain, Double, Neon, Raised, Sunken, Rounded, Frame, Cutout, Creative, Object etc)
Width (Absolute or Relative Percentage)
Primary Colour
Secondary Colour
Transparency
Corner Radius
Set Side (Top, Right, Bottom, Left)

Effects:

Blend (built-in and custom options)
Blur
Flare
Shadow
Stretch
Texture (including animated textures)
Transparency

Cursors:

From System or Custom Designs

Transitions:

On Show
On Hide
Length
Exclusivity
Preset Styles including 3D, Shapes, Scrolls, Fades, and Special Reveals

Text:

Font
Horizontal Alignment
Vertical Alignment
Padding
Background
Shadow
Kerning
Paragraph
Tabs
Static/Dynamic (for HTML5 and Flash)
Anti-Aliasing
Auto-Narrate Style
Hypertext Style
Use disk file

Drag and Drop:

Object can be Dragged
Object can be Dropped on Selected Objects
Fit to Drop Zone
Centre in Drop Zone
Arrange Objects in Drop Zone
Limit Number of Objects in Drop Zone
Object is Drop Zone
Save Drag and Drop for User Return

Resources:

Preload on Page Start
Load when Required

Permissions:

Lock Size, Shape & Position to fix your design whilst others edit content (Editor Setting Only)

Object States

See appearances for details.

Normal
Mouse Over
Mouse Down
Button Over
Button Over Down

Disabled
Disabled Down
Dragging
Dropped
Returning (as appropriate)

Opus Pro and Opus Creator Reference - Object Properties