Sack Library Documentation
sack::intershell::OnQueryShowControl Macro
#define OnQueryShowControl( name ) \
      DefineRegistryMethod(TASK_PREFIX,QueryShowControl,WIDE( "control" ),name,WIDE( "query can show" ),LOGICAL,(PTRSZVAL))

return TRUE/FALSE whether the control should be shown, else it remains hidden. this method is used both with MenuButton and Control. This is called after FixupButton(on MenuButtonOnly) and EndEdit( on Controls and MenuButtons ) this is called during RestorePage(Full), which is used by ChangePage() after HidePage().

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