Irwan,

You can drop an instance of your class onto a form and then call it's methods. You can set the classlib on the controls toolbar by clicking the books button. I find it a lot easier to drag a class out of the torn off All tab of the project manager.

You can also add the class at runtime:

this.AddObject( "oMyClass", "MyClass" )
this.oMyClass.DoSomething()

>how to activate the .vcx in my form.....
>where's procedure & how's the command should i start the .vcx and end it....
>in my form