MFC Dialog 2
Screen Coordinate and Client Coordinate
Programmers need to understand that there are two coordinate systems in MFC.
Screen Coordinates
Client Coordinates
Embedding Dialog
You can embed a dialog into a view or another dialog.

Steps to Embed a Dialog onto a View
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Open the Properties tab and set the Border property to None.
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Set the Style property to Child. By doing this, the dialog will appear as a child of the parent dialog or view.