At the left of the toolbar are five buttons:
The 
pop-up list allows you to switch editing views. See
Editing Views
.
The 
button brings up the Inspector window, which allows you to set various attributes of the currently selected element.
The Inspector
section describes each type of element in more detail.
The 
button brings up the Palette window. See
Palettes
for more information on creating and using palettes.
The 
button brings up the Validation window, which displays any binding validation errors on the page. See
Deleting Bindings
for more information about binding validation.
The 
button brings up the API editor, which allows you to set the binding specifications for a reusable component.