Task dialog and programming interface for same

A task dialog having a main instruction and a command region, and optionally a content and/or footer region, is automatically generated in response to a request from an application program. The task dialog main instruction is automatically sized and located so as to form a concise instruction or question located prominently in the dialog. A command region is below the instruction and includes UI controls for responding to the dialog. Optional content and footer regions can be used by a developer for inclusion of text that provides guidance to the user regarding the main instruction. If included, however, the content and/or footer regions are automatically sized and placed so that they do not obscure the main instruction or the command region controls.