I create a class (vcx) , but i don't Know how put it on my form by program.

I usually do what David suggests - add the class library to the project manager and drag the class from it onto the form.

You can also drag and drop the class from the class browser onto the form, but it is not as easy. You have to select the class in the class browser and then drag the icon at the upper left hand corner of the class browser to your form.