TAdvCustomFormDesigner.ClearBeforeLoad Property
Indicates if all existing controls must be deleted before a load operation is performed.
Remarks
When you load a form from a file or stream, the existing controls are first deleted, then the form is loaded. This happens by default, because ClearBeforeLoad is true by default. If you don't want the controls to be deleted, set this property to false.
Syntax
Unit: FormDesigner
property TAdvCustomFormDesigner.ClearBeforeLoad: Boolean