If we specify the horizontal alignment, we also need to specify the vertical alignment as otherwise the right-aligned columns would be also top-aligned, looking out of kilter with the other columns which are centered by default. Closes #16559. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77906 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775