Hi Rubén and welcome to the forums.
As there could be more than one event on the CheckBox or even the TextBox you are talking about, and to prevent any misunderstanding then it is always the best and most secure way to describe those problems by creating a most minimal application that demonstrates the problem(s) and then send your application to support [at] visualwebgui [dot] com with a link to this forum thread, along with some description about how to reproduce the problem.
Please also clean the solution before compressing it and reply to this post after sending, so we will know to check for your support request.
If there is a problem in there that we have not yet either fixed or is represented by one of the open issues, we will fix it. Please send us a sample app.