I thought that skinning was "dead and burried", but in the latest beta version of CodeJock 19.0.0 I found Windows10.cjstyles. It is possible to copy this file to the DataFlex 19.0 Skinning example's Programs folder. As you can see you can apply several Micosoft Office skins. Although it is a beta file of a new version, it seems to work (in a test environment). For caption bars it looks much better in combination with Microsoft Office themes.

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Object oCJSkinFramework2 is a cCJSkinFramework
   Set psSkinFile to "Windows10.cjstyles"
   Set psSkinIni to "Normal Microsoft Office Outlook.ini"