i have an old application (started in delphi 7 in Win XP), now i'm using delphi 2009 (win Vista). If i start a new project all buttons have a rouded edge, but in my old app all buttons have a "square"-shape look.
is there any setting that i've missed? thanks
You may have to create an application manifest file. The following links have some information:
http://www.codeproject.com/KB/cpp/AddXpStyle.aspx
http://msdn.microsoft.com/en-us/library/ms997646.aspx
Under the Project Options in D2009, there is an "Enable runtime themes" option which is ticked by default for new projects but unticked for pre-existing projects.
Ticking this adds the manifest file to the EXE's resource, which is what makes it use Windows Xp/Vista themes, which is what gives you the rounded buttons.
http://www.stevetrefethen.com/blog/ThemingWindowsApplicationsInDelphi2007.aspx
http://www.stevetrefethen.com/blog/Delphi2007VCLDesignerThemeSupport.aspx