The primary tool to use for GUI for .NET application development is Progress Developer Studio for OpenEdge, an Eclipse-based Integrated Development Environment (IDE) that includes a number of plug-ins, for example the OpenEdge Visual Designer, the OpenEdge Editor, and the OpenEdge Class Browser:
OpenEdge Visual Designer — The Visual Designer is a WYSIWYG tool that supports visual building of complex GUIs in ABL based on .NET objects. You create user interfaces with Visual Designer by dragging and dropping .NET controls onto a Design Canvas. The Visual Designer generates ABL code written as classes that encapsulates the creation of the WYSIWYG design code. You can get some hands-on experience working with the Visual Designer in OpenEdge Getting Started: Introducing the Progress Developer Studio for OpenEdge Visual Designer.
OpenEdge Editor — The Editor is a full-featured, color-coded editor for working with UI class files. For example, you run the Editor when you want to add methods that implement event handlers. Complementary to the OpenEdge Visual Designer.
OpenEdge Class Browser — The Class Browser is an Eclipse view that lists the members of either an ABL or a .NET class, showing the signature for each member in ABL syntax.
OpenEdge Visual Designer — The Visual Designer is a WYSIWYG tool that supports visual building of complex GUIs in ABL based on .NET objects. You create user interfaces with Visual Designer by dragging and dropping .NET controls onto a Design Canvas. The Visual Designer generates ABL code written as classes that encapsulates the creation of the WYSIWYG design code. You can get some hands-on experience working with the Visual Designer in OpenEdge Getting Started: Introducing the Progress Developer Studio for OpenEdge Visual Designer.