def collect_children_type_of(parent, ch_type):
    """
    Collect specific children of the tkinter
    parent element.
        - parent:
            The tkinter parent element.
            (E.g. a Frame).
        - ch_type:
            The type of children to be collected.
            (E.g. Entry).
    """
    collected = []

    for child in parent.winfo_children():
        if child.winfo_class() == ch_type:
            collected.append(child)

    return collected