add some checks for cb creation failure

Signed-off-by: Yakov Goldberg <yakov.g@samsung.com>
handle cb names on cb creations

Signed-off-by: Yakov Goldberg <yakov.g@samsung.com>
handle case on iteration over child windows, in case when main win exits/or not

Signed-off-by: Yakov Goldberg <yakov.g@samsung.com>