You need to edit the templates of the vertical SwimLanes and introduce RotateTransform or LayoutTransformControl. The styles you need to change are located in Resources.xaml file of the demo
Also you can consider only making the containers to be smaller in their Width. The text wrapping feature will wrap the headers of the containers so that every letter will be on individual row. This way you won;t need to introduce rotation on some grids / contentpresenters etc.
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