UINT BCGM_ON_SWAP_TABS

The framework sends this message to the tab control owner window when the user changes tab order. Add this message handler and return non-zero if you wish to prevent specific tabs from reordering.

Parameters

wParam	low word: a zero-based index of the first tab to be swapped; high word: a zero-based index of the second tab to be swapped.
lParam	a pointer to tabbed window (the sender)

Returns

return a non-zero value in order to prevent specific tab swapping.