How to design and call a form through X++ code

http://msdn.microsoft.com/en-us/library/formrun.control.aspx

static void createForm(Args _args) 
{ 
    Args args; 
    Form form; 
    FormRun formRun; 
    FormBuildDesign formBuildDesign; 
    FormBuildDataSource formBuildDataSource; 
    FormBuildGridControl formBuildGridControl; 
    FormGridControl formGridControl; 
    DictTable dictTable; 
    int idx; 
    int height;  
 
    // Create the form header. 
    form = new Form(); 
 
    form.name("myForm"); 
    // Add data sources to the form. 
    dictTable = new DictTable(tableNum(custTable)); 
    formBuildDataSource = form.addDataSource(dictTable.name()); 
    formBuildDataSource.table(dictTable.id()); 
 
    // Create the form design. 
    formBuildDesign = form.addDesign('Design'); 
 
    // Add a grid control. 
    formBuildGridControl = 
 formBuildDesign.addControl(FormControlType::Grid,'Grid'); 
    idx = formBuildGridControl.id(); 
 
    formBuildGridControl.addDataField(formBuildDataSource.id(), 
dictTable.fieldName2Id("AccountNum")); 
    formBuildGridControl.addDataField(formBuildDataSource.id(), 
dictTable.fieldName2Id("Phone")); 
 
    args = new Args(); 
    args.object(form); 
 
    // Create the run-time form. 
    formRun = classfactory.formRunClass(args); 
     
    formRun.run(); 
    formRun.detach(); 
 
    formGridControl = formRun.control(idx); 
    formGridControl.heightMode(-1); // Fixed. 
    height = formGridControl.heightValue(120); 
}