Button Caption

[C++ Programming]

i have created a 5 Buttons dynamically.
eg :
2) Button 1 contol id :5000
1) Button 2 contol id :5001
1) Button 3 contol id :5002
1) Button 4 contol id :5003
1) Button 5 contol id :5003,

i need to select caption name "Button 1" using its control id 5000;
i used RButtonup and i got control id. But i dont know how to get the caption of Button .Please help.