I cant find createPaintView() function in .m files of ti.paint module. where is it ?

Hello people, I had gone through all .m files of ti.paint module but didn't find createPaintView() function in these (you can see here). where to define such methods in our own module ?

when i tried with mine, the error I got was this

[ERROR] Script Error = -[UIView boundBridge:withKrollObject:]: unrecognized selector sent to instance 0xa026280 at moduletest.js (line 10)

the code in .m (other than assets.m)file is(in #pragma Public APIs region)#

#pragma Public APIs
-(id)createView:(id)args
{
    UIView *view=[[UIView alloc]initWithFrame:CGRectMake(0,0,320,460)];
    [view setBackgroundColor:[UIColor redColor]];
    return view;
}
 
-(id)example:(id)args
{
    // example method
    return @"hello world";
}

code in moduletest.js is #

var window = Ti.UI.currentWindow;
var label = Ti.UI.createLabel();
window.add(label);
 
// TODO: write your module tests here
var moduletest = require('ti.moduletest');
Ti.API.info("module is => " + moduletest);
 
var view = moduletest.createView();
window.add(view);

Thank You in advance.