Title of Metro Form

Hi Guys,

I follow this video for my Metro app. This is a video helpful with me.
Can you show me how to change the text "Metro Framework" (that is the title of the form: frmFrame in video)
when I click on the Tile Category or Tile Product with those name of Tile, or special text?

I just do with property frm.ActiveForm.Text, but it not work for all case as I need.

YouTube: C# Tutorial - How to use Winforms Modern UI Metro Framework | FoxLearn

YouTube:

Thanks you all.