Function dialog 

pub fn dialog<'a, Message, Base, Content, Theme, Renderer>(
    is_open: bool,
    base: Base,
    content: Content,
) -> Dialog<'a, Message, Base, Content, Theme, Renderer>
where
    Message: 'a + Clone,
    Theme: 'a + Catalog,
    Renderer: 'a + Renderer,

Creates a new Dialog with the given base and dialog content.