User Guide

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About the Dialogs Tab
When you finish adding and configuring controls, use other commands on the Layout
menu to help organize and arrange them. (In Visual Studio: use commands on the
Format menu.)
When you perform an operation on multiple controls at once (example: aligning
controls), the last control you select is the master control, which the other selected
controls will conform to. The master control is surrounded with solid handles instead of
hollow handles.