//..вверх

if buttons[VK_UP] and 128 <> 0 then

SendMessage(cmbUp.Handle, BM_SETSTATE, BST_CHECKED, 0)

else

SendMessage(cmbUp.Handle, BM_SETSTATE, BST_UNCHECKED, 0);

//..вниз

if buttons[VK_Down] and 128 <> 0 then

SendMessage(cmbDown.Handle, BM_SETSTATE, BST_CHECKED, 0)

else

SendMessage(cmbDown.Handle, BM_SETSTATE, BST_UNCHECKED, 0);

//..влево

if buttons[VK_LEFT] and 128 <> 0 then

SendMessage(cmbLeft.Handle, BM_SETSTATE, BST_CHECKED, 0)