Hi,

Try this in your xml view,

Use confirm= " your question " in your button ,

< button name="action_clear_all_lines" type="object" states="draft" string="Cleare All Lines" confirm="Are you sure want to clear all the computed lines?" / >

Hope it helps,

Thanks

in the end, I find the solution that, we can never return anything like a wizard from the write and from the onchange method.