If you will use TotalCross for a personal project that will not be shared with anyone, you don't need to worry about licence demands.
If you will show your project to others, you just need to make it clear that you are using TotalCross, include TotalCross source code, and with that let people know that LGPL'd software is being used in your work. As long as you do that you are covered to give your work away or sell it.
If you make any changes to TotalCross code you will need to send these changes back to TotalCross. If you did something really clever we'll definetelly consider adding it to a future version, so that more people can benefit from it.