2. Creating Widgets   

Creating your own widgets is a difficult thing - here is how it is done: (See footnote)

       Introduction  
       Implementation-specific Types  
       Widget Classing  
       Realizing Widgets  
       Obtaining Window Information from a Widget  
       Destroying Widgets  
       Exiting from an Application  
       Initiating Geometry Changes  
       General Geometry Manager Requests  
       Resize Requests  
       Potential Geometry Changes  
       Child Geometry Management: the geometry_manager Procedure  
       Widget Placement and Sizing  
       Preferred Geometry  
       Size Change Management: the resize Procedure  
       Executing Callback Procedures  
       Action Tables  
       Translation Tables  

Turn off images and have a look at John L. Cwikla's page for more information on widget building and a swag of Public Domain widgets.