BusyIndicator control
windows-phone-7
Solution
Have you seen the ProgressBar control? You can use the ProgressBar control to show that your application is busy doing something. It is recommended that you use PerformanceProgressBar by Jeff Wilcox (Remember to read his follow up post too, it is important to consider IsIndeterminate and its value).
If you wanted to create a splash screen with a progress bar in it, check out this example. Alex also shows how to customize the progress dialog in this post.
Problem
It seems that the phone control toolkit is missing the BusyIndicator control. Does someone know about one ? does something else specific exists for WP7 ?