Suffering with editing notebook pages

[questioner]

I made two notebook pages.
I copied checkboxes to the pages.
However, I can only select checkboxes on one page only.
When I go to the other page with show page 1.
When I click on the page 1, it selects checkboxes on page 2 despite of the fact that those
 are on the other invisible page 2.
As if the designer were mistaken which page is visible at the moment..

[Marc]

what version of lazarus (and what OS)
How do you select them ?
What does the objectinspectortreeview show ?

I can select them all in the tree or on the form