diff --git a/dsl/src/dsl.rs b/dsl/src/dsl.rs
index ffdf38c..90cbaed 100644
--- a/dsl/src/dsl.rs
+++ b/dsl/src/dsl.rs
@@ -9,7 +9,7 @@ use const_panic::PanicFmt;
 use std::fmt::Debug;
 pub(crate) use ::{
     std::sync::Arc,
-    //std::error::Error,
+    std::error::Error,
     konst::iter::for_each,
     konst::string::{str_from, str_range, char_indices},
     thiserror::Error,
@@ -225,3 +225,27 @@ pub(crate) fn ok_flat <T> (x: Option<DslPerhaps<T>>) -> DslPerhaps<T> {
         }
     }
 });
+
+#[deprecated]
+/// `T` + [Dsl] -> `Self`.
+pub trait FromDsl<T>: Sized {
+    fn from_dsl (state: &T, dsl: &impl Dsl) -> Perhaps<Self>;
+    fn from_dsl_or (state: &T, dsl: &impl Dsl, err: Box<dyn Error>) -> Usually<Self> {
+        Self::from_dsl(state, dsl)?.ok_or(err)
+    }
+    fn from_dsl_or_else (state: &T, dsl: &impl Dsl, err: impl Fn()->Box<dyn Error>) -> Usually<Self> {
+        Self::from_dsl(state, dsl)?.ok_or_else(err)
+    }
+}
+
+#[deprecated]
+/// `self` + [Dsl] -> `T`
+pub trait DslInto<T> {
+    fn dsl_into (&self, dsl: &impl Dsl) -> Perhaps<T>;
+    fn dsl_into_or (&self, dsl: &impl Dsl, err: Box<dyn Error>) -> Usually<T> {
+        self.dsl_into(dsl)?.ok_or(err)
+    }
+    fn dsl_into_or_else (&self, dsl: &impl Dsl, err: impl Fn()->Box<dyn Error>) -> Usually<T> {
+        self.dsl_into(dsl)?.ok_or_else(err)
+    }
+}
diff --git a/tui/src/tui_content.rs b/tui/src/tui_content.rs
index 184d7ea..34d5697 100644
--- a/tui/src/tui_content.rs
+++ b/tui/src/tui_content.rs
@@ -63,7 +63,7 @@ impl<T: Layout<TuiOut>> Layout<TuiOut> for TuiForeground<T> {
 impl<T: Layout<TuiOut> + Draw<TuiOut>> Draw<TuiOut> for TuiForeground<T> {
     fn draw (&self, to: &mut TuiOut) {
         let area = self.layout(to.area());
-        to.fill_fg(area, self.0.0);
+        to.fill_bg(area, self.0.0);
         to.place_at(area, &self.0.1);
     }
 }
diff --git a/tui/src/tui_content/tui_style.rs b/tui/src/tui_content/tui_style.rs
new file mode 100644
index 0000000..c7b7e81
--- /dev/null
+++ b/tui/src/tui_content/tui_style.rs
@@ -0,0 +1 @@
+use crate::*;