Just like Microsoft Visual Basic forms or HTML forms, Microsoft Outlook forms contain controls. And just like in Visual Basic or Visual InterDev™, you add controls to an Outlook form from a toolbox in design mode. You drag the control from the toolbox onto the active page of the form; then you can move it, resize it (in many cases), and change its other properties. This toolbox displays the available controls, such as labels, text boxes, combo boxes, list boxes, check boxes, option buttons, command buttons, the multipage control, scroll bars, and image controls.
You can also access a number of custom controls. Right-clicking the toolbox displays the Additional Controls dialog box. The controls it lists reflect those installed on your system as .dll or .ocx files. They can include design-time controls as well as run-time controls. To make a custom control available, click it, and click OK to exit the Additional Controls dialog box. The controls you selected then appear on the toolbox.
For information on the controls used on the EnhancedLitCrit form, including frame controls, text boxes, and option buttons, see Enhancements to the LitCrit Outlook Form.