change string "elm_win" to DB_DEF_WIN_CLASS

Signed-off-by: Yakov Goldberg <yakov.g@samsung.com>
fix adding creation callback

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

Signed-off-by: Yakov Goldberg <yakov.g@samsung.com>
fix passing NULL for GUI_TYPE_STRING/OBJECT/ENUM

Signed-off-by: Yakov Goldberg <yakov.g@samsung.com>
add third window into example

Signed-off-by: Yakov Goldberg <yakov.g@samsung.com>
fix: dont't generate json for empty callbacks

Signed-off-by: Yakov Goldberg <yakov.g@samsung.com>
add "auto_create" json generation

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

Signed-off-by: Yakov Goldberg <yakov.g@samsung.com>
fix generation of defferent callback names for CREATION event

Signed-off-by: Yakov Goldberg <yakov.g@samsung.com>
fix passing NULL data to CREATE callback

Signed-off-by: Yakov Goldberg <yakov.g@samsung.com>
add error message when trying to pass non-existant object as cb data

Signed-off-by: Yakov Goldberg <yakov.g@samsung.com>
add small NULL checks