In the dxLayoutLookAndFeelList designer's Preview section, checkboxes are always painted with NativeStyle.
LookAndFeel/skin is not taken into account.
See my image.
David Le Franc
Steps to Reproduce:
Add a dxLayoutLookAndFeelList
Add several LookAndFeel and skins
See checkboxes in Preview section
Checkboxes painted with NativeStyle
Checkboxes painted with chosen style/skin