Since a tab page is its own panel, you can enable the panel scroll bars...
GetPanelHandleFromTabPage(panelHandle, PANEL_TAB, 0, &tabPanel);
SetPanelAttribute(tabPanel, ATTR_SCROLL_BARS, VAL_VERT_SCROLL_BAR);
Gosh! So simple it was! There are so few attributes that cannot be set in the UIR editor that I didn't even thought about setting it programmatically!
Thanks jared for this tip
Thank you for completing the solution it was helpful.
Last weak i haven't been at work , so only today i saw the comments.
Thank you all.