How to set text for setdetailsprint?

Hello there,
I wrote a script which installs Dot net framework ,MySQL, MyApplication , One another add on application. But on the installer user interface while executing the different commands on the progress bar the command currently executing are being displayed. How can i set the custom text when executing the command.
I have used setdetailsprint textonly at .oninit function


PLease help.!

Use:

SetDetailsPrint both

DetailPrint "installing something..."

SetDetailsPrint listonly

ExecWait something

SetDetailsPrint both