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Hello.

I maximize a bar and, to the place of a green arrow, want to display it.

Thanks,

How did you maximize it? What is maximized bar in your message?

Hello.

It is A-Bar. ( CExtControlBar )

In this case you can only resize the separator between the bars manually.

Prof-UIS also supports collapsing/expanding the caption button for resizable control bars. But this button is experimental component and it’s not used by resizable control bars by default.

The caption buttons are initialized in the CExtControlBar::OnNcAreaButtonsReinitialize() virtual method where you can see the initialization of the CExtBarNcAreaButtonExpand button is commented:

void CExtControlBar::OnNcAreaButtonsReinitialize()
{
      ASSERT_VALID( this );
INT nCountOfNcButtons = NcButtons_GetCount();
      if( nCountOfNcButtons > 0 )
            return;
      NcButtons_Add( new CExtBarNcAreaButtonClose(this) );
#if (!defined __EXT_MFC_NO_TAB_CONTROLBARS)
      NcButtons_Add( new CExtBarNcAreaButtonAutoHide(this) );
#endif // (!defined __EXT_MFC_NO_TAB_CONTROLBARS)
      // NcButtons_Add( new CExtBarNcAreaButtonExpand(this) );
      NcButtons_Add( new CExtBarNcAreaButtonMenu(this) );
      // NcButtons_Add( new CExtBarNcAreaButtonFloatingMaximizeRestore(this) );
}

You can override this virtual method in your CExtControlBar-derived class, copy the body from original method and uncomment initialization of the CExtBarNcAreaButtonExpand button.