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Callback type for the OnGetPropValue callback event
Source position: typinfo.pp line 440
| type TGetPropValue = function( | 
| Instance: TObject; | 
| PropInfo: PPropInfo; | 
| PreferStrings: Boolean | 
| ):Variant; | 
The callback function must return the property with name PropName of instance Instance. If PreferStrings is true, it should favour converting the property to a string value. The function needs to return the variant with the property value.