I would just enter a textbox (TextBox1), then my 3 buttons. Then you would double click button 1 and set TextBox1.Value="What you want it to say". Then double click on button 2 and set TextBox1.Value="What you want to say in this instance". Just repeat for as many buttons as you have but you always are setting the value for TextBox1 assuming that is the name of your TextBox.
Let me know if you have any other questions.
Thanks!