GUI Builder is the part of AggreGate Client that is used to edit widget templates or build widgets from scratch.
Main Window
GUI Builder always opens in a separate window:
The main window has several primary components:
Most components in GUI Builder are implemented as dockable panes and may be removed, resized, docked/undocked, put into tabs etc. For more information, see Customizing Dockable Panes.
Properties Editor article has more information on using the Properties Editor. Component properties are described in the component reference.