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Revisa la propiedad Text.
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De la ayuda
PROP:Text is the text parameter of an APPLICATION(text), WINDOW(text), or any control(text). This property represents the parameter to any control or window declaration, and could contain any value that is valid as the parameter to the specific control's declaration.
There is also a usage of PROP:Text that applies to Memos and Blobs.
Example:
?Image{PROP:Text} = 'My.BMP' !a new bitmap for the referenced IMAGE control
?Prompt{PROP:Text} = 'New Prompt text' !new text in the referenced PROMPT control
?Entry{PROP:Text} = '@N03' !new picture for the referenced ENTRY control