StyleBuilder Part Window

Reset
Redraws the part screen. This will also reload any images that have changed.
Edit
Click on this to bring up the part with your default editor.
The down-arrow will show a list of configured editors, and allows you to add your own editor.
Image name
This will show the file names for the images displayed in the part window.
Preview Screen Windows
Red Window
By clicking and dragging the lower right corner, you can resize the part that is drawn.
This image is a true size image, and will not be stretched:
This image is stretchable, the black areas show where the margin. Margins can be adjusted by clicking on the "ContentMargins" property on the properties view.
Blue Window
By clicking and dragging the lower right corner, you can zoom in on the part, which will maintain it's aspect ratio.

By hovering over the part in the red window. The blue window will change to show you what state is being shown in the red window. Notice the blue bars to the right and left of the part.
Default :
Hovered, showing disabled state :