I think you got it abit wrong mate. You don't use 'Package' to import classes. You use 'Package' to declare that the file you write this in, belongs to the package you write. I'm not sure if a file belonging to a certain package gets access to other classes within that package (might be why you confused it with import).
Then you use 'Import' to import the package, or class, you wish.
Here I import the File package (class).
Here I declare that this source file, belong to the package 'myprogram'.
And as always, if someone can provide a better explaination, or correction, please do. As I'm here to learn as well.
For Each ctrl As Control In Me.Controls("pnlMainPanel").Controls
If ctrl.GetType Is GetType(System.Windows.Forms.Panel) Then
For Each subCtrl As Control In ctrl.Controls
If subCtrl.GetType Is GetType(System.Windows.Forms.TextBox) Then
If subCtrl.GetType Is ...