Delphi VCL "TaskDialog" problem in Windows 7

I'm developing an windows app on Delphi 2007 and I'm using "Ttaskdialog" component in it. Using windows XP it runs normally, but in Windows 7 I'm getting the following message:

TtaskDialog requires themes to be enabled

开发者_如何学JAVAAny clues how to fix it?

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To use TTaskDialog you need to enable themes in project options.

In menu go to Project -> Options... then to Application and check the Enable runtime themes box.