how do I open a custom module form in colorbox popup? I am creating a form in custom module, and I need to show this form in a view. How do I show this form in a color-box popup?

I have created a custom block to render this form, but I don't understand how to show this form in a view page, inside a popup.
I am suggesting you to use chaos tools for modal popup form. Its easy to implement and integrate into Drupal 7. I already used in my several sits.

You can find a great example of Ctools modal form at here