>What does "This.Parent" refer too?

Taken form the VFP Help on Parent Object Reference:

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References the container object of a control. Not available at design time; read-only at run time.

Syntax

Control.Parent

Remarks

Use the Parent keyword to access the properties, methods, or controls of a control’s container object. You can also use the Parent object reference to access the container object of a page or form.

The Parent keyword is useful in an application in which you pass controls as arguments. For example, you can pass a control variable to a general procedure and use the Parent object reference to access its container object.

You can also use the Parent object reference for objects in a control class that have been placed on an unknown form.

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This = this object.
Parent = the immediate container object.

HTH,
Tom