The object properties dialog allows you to modify specific settings or properties for the selected object. Most of the objects can also be moved or resized to specific co-ordinates or sizes using the Position & Size boxes at the top of the dialog properties sheet. Some objects cannot be resized or have their layers changed, so these will be greyed out.
If you do modify any of these properties in the property sheet, you must click Apply for the changes to take effect. Some objects like the webview object cannot be layered as they are Window objects that are always drawn to the top.