Interesting requirement. I seems that we don't have something of that kind inbuilt in ThingWorx. Maybe you will have to write your own extension for that.
But I thought a bit about this and a possible solution could be to use Tab Widget for this. You can change the SelectedTabValue regularly (at a defined interval) using some custom service and Auto-refresh widget.In the latest version you wouldn't even need a Auto-Refresh widget as you can use Automatically update values in Mashup using GetProperties service.
So it will switch to different tabs regularly.
On the mashup side, you can have an expression widget which computes 1,2,1,2,1,2, you can set the output of the expression widget as the input for itself, and the expression should be something like ( expression widget should have a parameter called currentValue ) :
Then you can bind the result of the expression widget to the previous service.
Once done this, you just need to set the Autorefresh widget to trigger the expression widget.