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OCR: COMPUTER PROGRAMMING 683 What is a VDE? A VDE (visual development environment) provides pro- grammers with tools to build substantial sections of program by pointing and clicking rather than typing lines of code typical VDE is based on a form design grid that a programmer manipulates to design the user inter- face for a program. By using various tools provided by the VDE a programme can ppe objects, such as controls and graphics, to the form design grid In the context of VDE, control is a screen -based object whose behavior can be defined by programmer Frequently used controls include menus, toolbars, list boxes, text boxes, option buttons, check boxes, and graphical boxes Figure 12-12 shows form design grid and illustrates variety of controls that can be added FIGURE 12-12 Pizza X form de ...