BCGControlBar Pro for MFC
BOOL CBCGPMDITabParams::m_bActiveTabCloseButton

Specifies whether to display a close button on active tab.

If TRUE, a close button will be displayed on active tab. The close button will be removed from the right top corner of tab area.

If FALSE, active tab will not display close button. The regular close button will appear in the right top corner of tab area.