怎样Create a new dialog with the Designer？

在KDevelop2.1的帮助文件中有如下叙述:

12.1 Create a new dialog with the Designer
if you want to create a new dialog,simply add a new Designer file.Go to the menubar and choose File->New.From the box choose"Qt Designer file"and enter a name,for example 'ktestdlg.ui'.the .ui file is where the Designer stores the information about the dialog.Now the Designer will come up and ask you which kind of template you want to use for your class.Let's choose "QDialog"for our example.Now the Designer will present an empty form called "form1" and the Property Editor.

可是,我遇到的情况是:在一个Project中如上操作,输入文件名ENTER后,出现一DIALOG提示:"您是要把它作为ASCII文件加载吗?", if(yes),打开一空文件,else,又一个DIALOG,提示"打开用..."要求选一程序.这和帮助中所述有出入,选QT来打开,也和上述后续不太一样.不知怎么回事??一个怎么也入不了门的笨蛋恳请指教.