So, I first thought this is easy but then realized it's a bit more tricky than I thought..
I have a gallery, that has a checkbox and what I want to do is, if none of the checkbox has been checked, then the "Create Relationship" button will be disabled.

This is my code on the DisplayMode field of the button (Create Relationship):
If(chkSelected.Value, Edit, Disabled)
chkSelected is the name of the checkbox in the gallery.
The problem is since "chkselected.value" is referencing all checkboxes within the gallery, if the user checks more than 1 checkbox then uncheck one of those, it'll disable the button.
Is there a way to code it to within that gallery list, if no checkbox is checked, then the button is disabled, but if there is one or more checkbox that is checked, then the button is enabled (Edit mode)?
Thanks!