I have tried use TaskDialog class in VistaBridge Sample but i have a problem, when i try to all the TaskDialog.Show(), an exception will be shown that says: unable to find any entry point named "TaskDialogIndirect" in DLL "ComCtl32.dll".

i searcher about this and found out that this comctl32.dll is version 5 not 6, it's the reason that makes this exception but my operating system is windows 7 and now i have checked my comctl32.dll, yes it's 5th version. bow i have a question in this operating system any projects i downloaded is working well but when i use them libraries and dll(s) my project now working, why? a pirson in internet said you should usemanifest, but how can i do it, please help me how can i view and use TaskDialog.Show() function in Windows7 operating systems?

when i use this function in Program.cs, it works very well but when i use it in another file in same project, the exception will be apeared.