Language Reference Guide : System Classes : FrameExec Class : IsClosable Attribute
 
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IsClosable Attribute
Data Type: integer
4GL Access: RW1
Determines whether the frame has a Close button in the title bar.
Possible values are TRUE and FALSE. To display a Close button, IsTitled must be TRUE.
You can set this attribute only before the frame is realized, either by setting it in the Frame Editor or by setting the attribute in the with clause of a callframe or openframe statement, or by setting it in the frame's initialize procedure.