Excerpt from http://msdn.microsoft.com/en-us/library/ee691831.aspx
Native 64-bit processes in Office 2010 cannot load 32-bit binaries. This includes the common controls of MSComCtl (TabStrip, Toolbar, StatusBar, ProgressBar, TreeView, ListViews, ImageList, Slider, ImageComboBox) and the controls of MSComCt2 (Animation, UpDown, MonthView, DateTimePicker, FlatScrollBar).These controls were installed by previous versions of Microsoft Office and are installed by 32-bit Office 2010. An alternative must be found for existing Microsoft Office VBA solutions that utilize these controls when the code is migrated to 64-bit Office 2010. 64-bit Office 2010 does not provide 64-bit versions of the Common Controls.
Does anybody knows where or how to find such alternatives???